Functionally, yes anyone wanting to trade will likely use a centralized service.

That's one of my main gripes with bitcoin and all the others today. I don't agree with some of the original bitcoin papers ideas and goals, but at least the idea if being peer to peer makes sense.

The fact that today both securing and using these "currencies" requires a centralized service completely ruins the point of them. At best they're faster than wire transfers, at worst they're just a means to gamble on less regulated assets.