I'm not saying bitcoin prices will crash anytime soon. Simply that the dream of bitcoin replacing fiat currencies in daily commerce is just that: a dream.
Another option is to use lighter alt-coins in parallel to bitcoin, again using bitcoin for long-term storage or larger transactions.
You are right that the current bitcoin as-is is not suited for many small everyday transactions, as envisioned by many. The transaction rate and fees are just too high. This is actually - besides governmental bans - the one thing I think could take bitcoin or cryptocurrency in general down.
Technically. Impossible.
For the original bitcoin that is currently being priced at $13,000 it is indeed technically impossible to exceed 6 transactions per second. Sure you could make a new crypto protocol, but it's not "bitcoin".
If your argument is "any improvement to the current system" "isn't bitcoin" then that's a no true scotsman sort of argument and I don't think it holds much water.