I'm not trying to bash the entire idea or the concept, but in the form you suggested it seems very strong, so I am not -1ing the idea or anything, just trying to play out how that would work in game, in my head.
In a similar theme, I had always thought traps should be the natural counter to sneakers (except maybe for sneak trappers, but even then), but they aren't really utilised in PvP, and there isn't much variety when it comes to traps, so that is a bit of a shame.
If say, there was an area trap, that when triggered, dealt light amounts of damage you would reveal sneakers with them, also it would use up the trap doing so, making it a bit harder to constantly spam them out everywhere, which could ruin sneakers entirely.