I imagine they'd jump to the next thing for the same reason they jumped into Bitcoin. Bitcoin became a pyramid scheme speculators looking to get rich.
So for example, let's say some shiny new AI gimmick comes along that is yielding BTC 2011-style gains. Those speculators would take their money out of BTC and into the next get rich opportunity.
I don't have a crystal ball, I just see vulnerabilities in BTC's position and am being cautious.
If BTC was just used as a currency like it was supposed to be, the price wouldn't be so inflated right now. It's a looong way down if it pops.