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It's the stuff of nightmares to think about having an ever-growing population of dragons (;;;*_*)
In the best situation, humans and all other races would be slaves to the whims of the dragons, dying one after another.
In the worst case it is the end of the world.
Wait! (◎ ◎) That doesn't sound like…
I always thought the reason Dragons only lay one egg in TCF (being Sherritt the only exception) was a bit obvious, and then realized I'm stupid for thinking it was obvious, so I'll share my thoughts.
It's a way to avoid overpopulation.
Think about it, each ecosystem has its own rules and there is a reason why invasor species (animals that were thoughlessly released in an ecosystem they didn't belong to) are considered invasors.
They tilt the whole balance within, they eat other species that eat plagues or help pollination, and end up becoming a plague.
What do you think would happen if Dragons were social creatures? What do you think would happen if they reproduced like humans or could lay more eggs like, say, snakes?
Dragons are the Apex Predator of Apex Predators. Just one of them can destroy a whole country, the ecosystem would collapse if too many inhabit the world, it's not like Dragons would hesitate to get rid of anything inconveniencing them
So yeah, nature has to have a way to keep them in check