Bitcoin will stay and its not just about money its a new Technology future the banks have to accept bitcoin or they simply will be out of Business.
rich people are very smart people, when they buy something, they think about making a profit and also think about the future of the thing for the next 10 years. If paypal has accepted bitcoin and many rich people are buying bitcoin Is because they know that bitcoin will stay for a long time and that governments are already forced to accept bitcoin and that they will be added will be more centralized and stricter KYC systems, but bitcoin will not disappear , will only be regulated
Also i think that many alt coins will not survive but i think ethereum will stay together with bitcoin and stellar and neo are strong ones too.
in the case of altcoins the issue will be very complicated for regulators and altcoin owners