I think it is better to tell the whole story:
Nasdaq bubble popped because people were investing a too much too early, they were anticipating future returns but nowadays Nasdaq has surpassed by far the ath when the bubble popped.
Something similar may happen in the crypto world, many alts will disappear, as it happened with some tech companies, but crypto world has definitely a future, the same way tech companies had a future when the bubble popped.