Now I keep asking myself: what is Bitcoin’s “final boss”?
Bitcoin blockchain and network is decentralized and there is no such a decentralized final boss.
Is it scalability?
Don't let you obsessive about scalability, as Bitcoin Cash scam team took advantage of scalability demand and made their scam fork. Years later, with better scalability, their Bitcoin Cash blocks have never been filled and Bitcoin Cash blokchain has been used less than Bitcoin blockchain.
Is it regulatory pressure?
You can not stop it so let it be and don't mind about it. Fortunately, Bitcoin is decentralized so regulations can not kill Bitcoin.
Is it energy debates?
Energy FUDs, you can read about them
End the Bitcoin energy FUD.Debunking the "Bitcoin is an environmental disaster" argument.