For me at least, "Imagine the possibilities!" is not an answer to the question, "What's it good for?" Indeed, my experience is that it's almost an anti-answer.
For example, in the mid-aughts I was talking with the CEO of a well-funded "semantic web" company about joining. I liked the people and the tech was cool, but I just couldn't figure out how it would turn a profit. His answer was similar to yours, a "what couldn't they do?" answer. Turns out they never found an answer, and got acquired for their technology without ever turning into a real business.
As somebody who used to write software for financial traders, it's not clear to me that removing clearing houses is a step forward. They provide important services. And I'm even more skeptical that allowing randos to trade in opaque, unregulated assets is a good idea. Music industry actors, for example, have decades of experience in creative accounting and screwing people over. Real estate has a strong caveat emptor tradition, and property management companies are not exactly a watchword for fair dealing. So from you description, I'm mainly imagining people all over the world getting fleeced with no practical legal recourse.
As best I can tell, the cryptocurrency space seems hell-bent on rediscovering why strong markets and government oversight exist in the first place. The only demonstrated market advantage Bitcoin has in a decade of operation is in light financial crime like money laundering, capital control evasion, ponzi schemes, ransom payments, and outright theft.
I do hope these technologies turn out to be useful for something. But the "imagine the possibilities" routine worked much better when there was less of a track record. Now I'd rather examine the actualities.