Not in in its current form, no. I like being able to solo Heroic and Nightfall, plus some people like to 4 or 5 man the raid. Forcing matchmaking will prevent that. If matchmaking was on a toggle, I'd agree it would be ok. Matchmaking for Raid is asking for AFKers, where AFKing would be a complete waste of the other people's time. I could still solo a Nightfall/Heroic if there was an AFKer.