Okay this is a really old thread...and sorry for dredging it up out of the past, but this is what lead me to this forum.
Just wanted to comment that I don't put much stock into "What-ifs". I know the Phoenix draws a lot of fanboyism, but anyone with a modicum of knowledge about the MU knows that the Living Tribunal would never allow her to destroy an entire universe.
If what happened in that "What-if" were to ever occur, LT would surely interfere. He would probably cage the Phoenix like a canary and bitchslap her to destruction. 😄