Has this ever happened before?
Follow-up questions:
If there becomes 100 trillion wallets in use, do you think finding a wallet with a balance will become common? Is the current private key secure enough to last 10,000+ years?
Is there a way to scale up the security of the generated private keys somehow if needed someday?
A key collision has never happened and will not happen in the life of bitcoin, if the human race is still using bitcoin in 200 years time, never mind 10,000 then we have been utter failures......