I think stealth should be longer duration, more stackable outside of cooldowns, and talents should be based on seconds in stealth as opposed to going in and out of stealth. Stealth melee attacks should have stickier tracking, and backstab should do bonus damage on flank too. Sentries in WvW should have their range quartered to enable obnoxious ganks any time anywhere.
Then detect skills should be more available on all classes so there is no excuse, and any complaints of stealth can be ridiculed with "L2P". You should feel like a reveal on a ~12 second cool down might be worth your damage signet.
No ranged class should feel safe running full glass cannon in pvp or wvw, and stealth classes should be empowered to enforce that.
Some players might have a problem with this, but I won't.