And that's how those (trustless) decentralized ledgers should market themselves. It only needs to come down to that one simple thing: they increase the surface on which supply and demand can interact. The resulting friction generates wealth.
Lots of markets remained untapped because of that third-party need. Forgive the punctual essentialism, but increasing "capitalism"'s reach to those uncharted territories is good. In fact, it is precisely why I think it will take-off: the derived utility from an economic point of view is too high to be ignored.
Sometimes you don't need it to be trust-less or permission-less because some industries only have a handful players who already trust each other. That's not the full picture.
Obviously, there's an efficiency trade-off. But, don't make the mistake to throw the baby with the bath water. No system is perfect. No complex system behaves like it should. Bitcoin is imperfect. There are lots of bullshit and koolaid. Nonetheless, I believe the trend since Satoshi, with the long historical line of research he has built upon, published the Bitcoin paper is clearly upward. It should continue. Satoshi was the spark. Now (r)evolution will be incremental.