99% dotcom companies failed in 1999 tech boom, however investors that had a diversified portfolio saw the $$$ overcoming all the losses on the few that have had sucess, in crypto it will be the same I belive.
I don't know the future, but if I had to guess I think it'll be slow loss of momentum as people realize that the majority of these projects are flashy websites and not much else. Cryptocurrency has utility as a CURRENCY and not a whole lot else in my opinion.