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.
Bitcoin will make a fundamental change only when it faces an existential crisis, like facing imminent threats from quantum computers.
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.