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"Team Impossible" could have been a great episode to introduce mentor-like characters to Kim and Ron. Instead, Team Impossible is a bunch of jerks who want Kim out of the business for the shallowest reason possible - Kim doing missions for free is cutting into their profits.
There were other reasons they could have given for wanting Kim out of the business. For example:
They won't almost get embarrassed out of existence like Kim in "Blush".
The have plans for if one of them is too sick to go on a mission, unlike Kim in "Sick Day".
They'll actually put stuff they're guarding in safe places, unlike Kim in "October 31st" and "Adventures in Rufus-Sitting".
They won't misuse potentially dangerous gadgets (for personal gain), unlike Kim in "Queen Bebe".
They were able to take down Drakken and Dementor in the time it took Kim to show up. (Granted they were sabotaging Kim's rides, they're still quick and efficient.)
They're full grown adults who are mentally and emotionally developed enough to understand the dangers they're putting themselves in.
They have the experience and training to handle themselves instead of relying on the good will of others.
They don't have to balance saving the world with things like school, clubs, or dates.
Like, there are a lot of good, valid reasons for adults to not want a couple of teenagers to save the world, but instead we get profit.
Also, getting paid for their services isn't so bad. Their resort, training, equipment, and transportation all cost money just to maintain.
Unlike Kim, they don't have people giving them those things for free, so they have to charge somebody.
(And they checked a guy's credit before charging him, probably to make sure he could actually afford it.)
There are a lot of things more important than money, I won't argue with that.
But, since they're footing the bill for all the expenses themselves, it's not wrong to ask for financial compensation for this service. If they didn't, they'd eventually be unable to actually do the job.
(And the guy who charged didn't seem to upset about paying anyways. A little taken aback at first, but not upset. He even gave them a gift basket as well.)
However, I digress.
The point is, there are actual, valid reasons for them to want Kim out of the business, profit didn’t have to be the issue.
Lack of experience, lack of training, and careless mishandling of certain missions would have been enough and would have had the potential for introducing possible mentors.
They could've been people who helped Kim learn from her mistakes and grow from them.
But the creators have a habit of introducing someone to the show who also saves the world and then have Kim be either better, like with Will Du, or more moral, like with Team Impossible, so we never see them again.
Thus, Kim is the lone hero in the world.
And she shouldn't be.
While I love the idea of Ron deciding to end things with Kim after "Crush", there are definitely other times when Ron could've ended his friendship with Kim, and if you're interested in that trope in fanfiction, I think you might find this list helpful.
After being forced into a haircut in "The New Ron", Ron decides Kim's controlling behavior is too much for him. He ends his friendship with Kim and calls her out for her behavior.
After using mind control on her brothers at the end of "The Twin Factor", Kim is grounded for a long time, leaving Ron to handle missions alone. This would cause Ron to realize his own skills, and put a strain on his relationship with Kim as she can't stand to watch him succeed on missions without her. Kim also finds herself with fewer babysitting jobs once word of her using mind control on her brothers gets around.
Kim finds herself getting fewer missions after word of her negligence and reckless endangerment in "October 31st" gets out. She also finds herself banned from Monique's house since she destroyed the garage door.
Upset over GJ thinking Ron is the secret to her success in "The Ron Factor", Kim tries the solo hero thing, and fails. Unfortunately, her parting had left Ron hurt and upset, and he's not interested in coming back to Kim.
After "Adventures in Rufus-Sitting", Rufus manages to communicate to Ron what happened while he was away, and Ron gets angry that Kim not only neglected and endangered Rufus, but lied to him about it. Ron ends things with Kim as he doesn't know how he can keep being friends with someone who cares so little about Rufus.
Ron comes back from his trip in "Exchange" with new skills, new confidence, and an unwillingness to put up with Kim's controlling behavior. So he takes a break from Kim when she gets to be too much for him.
After constantly being ignored about Gil in "Return to Wannaweep", Ron decides to end things with Kim and look for someone more supportive. Kim finds herself booted from the squad after they learn about how she intentionally sabotaged her own teammate to succeed.
Team Impossible from "Team Impossible" uses legal actions to keep Kim out of the save the world business, at least until she's 18, due to the reasons mentioned in my post about them. They offer to train Kim and Ron in how to be better heroes, but Ron is the only one who accepts.
Feeling abandoned in "So The Drama", Ron decides to confront Drakken alone. He succeeds, and it starts a new chain of events where Ron realizes how little Kim cares for him and decides he deserves better.
There might be episodes in Season 4 that could have Ron end things with Kim, but I feel like at that point it would take a lot, and Kim didn't do anything truly heinous to Ron so he wouldn't.
If anyone can think of any other episode where they think it would make sense for Ron to end things with Kim, please feel free to comment!