Even if I think that 2 jobs means 2 dps is a likely theory, I don't like it myself. For SAM, I want it to be a tank. Also think about the fact that RDM and SAM are both fan favorites and as dps AND expansion attractions they will dominate the scene for quite some time. During that time, DPS queues will be hell, be it levelling or even endgame.

I myself don't have an issue cause I almost exclusively play on my DRK. But what about the game quality? The best option in my opinion is to add SAM tank and another healer for a total of 3 jobs covering the trinity.