They also have a poor reputation, and for what seems like a good reason. It's a risky proposal that generally attracts a get-rich-quick kind of community. Examine the Nikola company and tell me how comfortable you'd be investing a sizeable chunk of your net worth in that.
I can't predict the future, but I can bet $10k I will die before SPACs get to even half of VC funding. Side pot of $1k that 50% of them fail their investors, and another side pot that one in the next decade will be a historically spectacular failure.