Linus Torvald was in a recent Linus Tech Tips video and I think his take was good.

Why can't it be both a bubble and revolutionary?

I use it, I'm cautious with it, but it is useful, if it wasn't stack overflow wouldn't be where it is today.

Now, that doesn't mean that these crazy investments will bear fruit. Lately, money just doesn't feel real at all. Trillions are being invested and investors are hoping for returns within 5 years!?