On the other hand being overly optimistic about ideas that are clearly silly/inefficient/worse than every other option is how you waste millions of dollars on things like solar roadways or the Dodger stadium dugout loop.
Skepticism does not mean inaction. It's about using the energy, time and resources you have to build useful things. While cryptocurrency has defiantly inspired the masses to forfeit their money, it still hasn't proven to be much more than an elaborate wealth consolidation device.