You seem extremely confused, and I'm not sure that I'm getting what you're saying anymore. Basically you're saying that if you kill your enemy, then you're playing defensively since he can't kill you anymore...
---------- Post added 2013-01-08 at 09:51 PM ----------
Although that'd be probably impossible, I can't help but admit that I'd always like to see the Imp benched. Always hated that demon since level 10 (yes, level 10).
But I really doubt Blizzard would ever give us that benefit, it's just too much. I mean, you get 5 sets of utility which would make up for almost all the buffs and CCs in the game.
The idea with all demons bringing a buff with the badass Demo raidbuff icon would be lovely though :3 But no Blood Pact mechanics, just a buff that doesn't depend on range.