+1 to this.
Community, instead of attacking Severlin and his inability to say, "Yeah, instead of continuing on with the enhancement trees pass I'm going to also start a 'Stealth Up' campaign," I think bbqzor has an excellent point: just hack assassinate.
It would be a temporary work around, but really the best thing here is probably just to make assassinate attacks special in some way that prevents them from easily breaking stealth.
Better to get assassinate working properly again than to get an assassin update with a bunch of unhappy players that can't...well...ASSASSINATE.