Originally Posted by cherokeesam
Because Thanos is still an x factor, an unknown variable at this point. *If* he becomes a hugely popular villain, like Loki has become, then yeah, I could see Marvel bringing him back again for Phase III. But let's cross each bridge as we come to it. At this point, we don't know how Thanos will be received by audiences at all, so it would be pretty suicidal to start hinging *future* projects on a villain who fans might or might not want to see more of.
edit: screwed up quoting, put it in my next post