Mate, you can't even be profitable with a decent gaming computer with a high end graphics card mining Bitcoin, how do you think USB mining will end up?
Alas, those usb sticks do up go tera range of hashes, way more powerful than the best gaming computer out there.
USB mining was a dumb concept to start with
I am sure the guy that solved a block last year using a usb stick with disagree with your statement.
You all need to understand that those USB sticks are actually ASICs, just using a lot less chips.