It's naturally more appealing and the only way to counteract this is to make DPS play a bigger part in team dynamics... Which is exactly what Cataclysm is doing.
It's trying to, at any rate. I don't think it's succeeding to the level that either Blizz or some players might prefer.
A big part of the discussion on the healing forums right now is how the attempts to make what the DPS do more important ends up just shifting more responsibility onto the healers and tanks. This is, again, mostly for social reasons. It would work beautifully if more players actually played the game the way the current model demands.
The DPSers who get it and do what needs done this expansion are a joy to heal for (and I imagine tank for, I haven't tanked yet this expansion). But many groups still won't CC or interrupt and get pissed at a healer or tank who might need it. In some cases, a healer or tank gets pissed at the other role for needing it. Those of us who have already geared our tanks/healers have an easier time with this than those trying to get into those roles now.
Blizzard can't fix players' bad attitudes.