Bitcoin is legacy Blockchain and I am very bearish about it in long term unless developers improve it. I guess Bitcoin will slowly become just a novel experiment and a alt which have beat technical and economic features will win over Bitcoin.

Defi has already started to make Bitcoin weak. Alot of bitcoin has been migrated to ethereum chain.
Defi sector is booming , I think most of the money in Bitcoin will move to alts and Bitcoin will be remembered as first crypto in future with respect but will not survive and will be run by very few for just as mark of respect. Price and marketcap will also tumble to experiment levels.

So everything remains in hands of Developers and miners if they can enhance the Bitcoin Blockchain else it has too many problems to become the best choice in future.