Most of the current 'use cases' are indeed horseshit. I don't think anyone outside of a few nutters cares about decentralised file storage or dog walking ICOs. I'm pretty confident not one single project built on top of the base layers that's around now will be around in five years.
However this very moment today try sending some money from your bank in Denver to a holiday rental in Sumatra and see how long that takes, how much that costs and whether it'll ever bother to arrive. There is so little comparison to Bitcoin it's pitiful and it's genuinely bizarre that it's still considered acceptable in these fast paced times.
As for other applications I think overall we'll see a curve of actual usage very similar to the dotcom bubble. No one'll know what to do with it. They'll drive prices sky high anyway. It'll collapse. Someone will figure out what to do with it and then it'll take over the world.
The most compelling uses probably still haven't been conceived yet.
This is a genuine usecase where Crypto could be useful. But it requires blessings from the Government. Else you could easily be stamped as doing Money Laundering.