Theres a reason why Bitcoin was called a bubble..
I strongly believe Cryptocurrency will bounce back... but in a different form with a higher hash function than SHA-256 and probably strictly managed by some elements within the G8.
Bitcoin was a test but the world must still go fully digital in basic finance administration and other areas as well
When people say this is exactly like dotcom bubble I do get upset a bit, crpto has a lot more potential to change our lives than just amazon, if amazon wasn't a thing we would still be fine by just buying at a store, crypto will become big enough to change the world so much that we will say how we lived without it and create new stuff we can't live without.
That being said the common thing is that when dotcom bubble happened there was a lot of companies that got funding and attention without merit and they became really rich without really putting much work into it just like some shady ICO coins that got funded millions of dollars in span of couple hours but they lacked the tech behind providing many stuff.
Hence, the reality is just like dotcom bubble there will be a lot of coins and money lost but the great ones will prevail and become even bigger than they used to.