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.
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.
But im sure the bitcoin will be not some wild imagination out law but will be here for long and banks will accept bitcoin and will finally say Yes bitcoin is good and ready to go to the masses.
Becouse the technology is so great
For a long term investment, I'm sure that bitcoin and Ethereum are really gonna stay and will continue to increase their market value.
A lot of popular cryptocurrency in the market that has a solid demand is gonna stay for long term investment, but for sure compared to other dead tokens in the market bitcoin demand is already solid.
But still, just like the bitcoin technology that is gonna last for a long time, new technology could also be created in the future that is probably gonna be better than bitcoin that is sure will have a big effect on the market price.