ah, the smug eliteism in this thread...you guys do realise that your just one quarter of the group right? being a tank does not make you an almigthy god with rights to decide who gets to stay. hate elitist jerks like you guys.
The fact that I've seen many a 3 dps/1 heal group utterly annihilate things doesn't help their cause much either. Indeed, I've yet to do a flashpoint where 3 dps/1 heal hasn't done better than tank/heal/2 dps.
If anything I've more often felt like its the rest of the team having to support a player who gimps their damage (something that helps the entire party because 'dead' is the ultimate in crowd control) for marginally better personal survival.