I agree with you that there are a lot of bitcoin competitors and may be able to replace bitcoin. But this is not easy to do, it is very difficult and has little chance of doing.
I believe the main enemy of bitcoin is not a crypto, but people who hate and dislike bitcoin.
bitcoin is very difficult to beat by other coins, I agree with you, that bitcoin's biggest enemy is the people who hate it, we all know there are some governments or banks that do not like bitcoin.