1) [Short Term] If they fail to solve the scaling problem(s) or make major errors or have ugly "civil wars" then many people will drop BTC like a rock (get rid of it), and new people will not join in. That is why, IMO, it is VERY IMPORTANT to get an solid agreement ASAP on this issue that is OK with the Developers and the Miners.
2) [Longer Term] Yes, given enough time, another crypto is likely to come along with better features, solid financial & technical backing, etc. to supplant Bitcoin. Technological progress almost always has losers too.
It is obvious the rise in market cap from ETH and the other alts is a direct result of the inaction of consensus to scale with the pace of demand. I also am of the belief that segwit and lightning networks is not enough, and possibly a wrong move when increasing the block size would work and has been begged for.
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Re: Craig Wright: "You dont need to hold the blockchain. Its ok if only banks do."
Everyone should not be listening to that guy. He is a scammer and a fraud. Maybe the only reason he is coming out and doing that talk is he needs some funding for a new "scheme" he is working on.
I still do not know why Gavin Andersen, of all people, verified and declared Craig as the real Satoshi. Was Gavin trying to discredit himself? Some say he has been acting weird since the CIA meeting years ago.
Maybe he is Satoshi, If your hero turns out to be an abrasive Aussie I'd imagine it would be hard to believe.
Kinda like online dating, sometimes real life is far worse that what we had envisioned...lol
Anyway, everyone should be listened to and people need to decide whether what they say is true or not, to tell people what to believe almost always has the opposite intended effect.