Good thing about Bitcoin is that it might push for next gen computers (quantum computers etc.) to break it. It forces us to invent something even better. Until then I don't see Bitcoin going anywhere but up.
Bitcoin will switch to a quantum resistant encryption algorithm long before that becomes a threat.
Lightning took care of increasing the number of transactions Bitcoin can handle. Apparently the folks who wanted to keep the block size the same won; the Bitcoin cash is essentially worthless now. Meanwhile, Lightning is doing great: https://bitcoinvisuals.com/lightning
Why do you think it can do a more fundamental change?
Because there's $300+ billion at stake, which could be at risk with quantum computers in the future. It's already being planed for.
Bitcoin will make a fundamental change only when it faces an existential crisis, like facing imminent threats from quantum computers.