I think, as long as there are new coins being created. cryptomania will last forever, changing from one coin fever to another coin fever. And since there is always new coins everyday and some of them is here to stay for a very long time, the cryptomania will keep on going and going endlessly.
Yes I agree with this there is a new coin then it will last longer because coin turns occur with new coins emerging so that it can extend the life of crypto behind all that with the increase also the number of users can influence it.