The problem I have with this is that the lex/joker/mmh thing was just normal tech. The thing you're being pushblocked into is there for a finite amount of time, which makes attacking a risk, but gives you universal ways of avoiding it (throws). It's fair because those things disappear in a few seconds at most. Sinestro can just sit there for the rest of the match and wait to pushblock. So thanks, I guess, for ruining something that helped even out hard matchups.
edit: it also doesn't even fix one of the reasons the sinestro pushblock is so good. if he can spend a bar and a trait shot to send a character like lex fullscreen again, why not?