"Pinellas Circuit Court Judge George Greer, who issued an emergency stay on Tuesday, extended that order for two more days on Wednesday, saying he needed more time to determine whether Michael Schiavo was fit to be Terri's guardian. "
I think THIS is the crux of the matter. The judge doesn't have to decide whether Terri should or should continue to be provided nourishment, he needs to decide, whether her current guardian does indeed have Terri's best interest at heart or not. The answer to that is obvious, of course.
I think that's a dodge. I think the real question Greer is considering is whether the likelihood of him successfully covering up his crimes by killing Terri is sufficient to justify the greater punishments he would face if he fails. He may decide that coming out to save Terri at the eleventh hour would look much better at a sentencing hearing than continuing to murder her even after it's obvious that he knows that's what he'd be doing.
I would not also be surprised if Greer is contemplaying buying a one-way plane ticket someplace, although personally I'd rather see him turn state's evidence against Felos, especially if (as I suspect) Greer's mainly been acting as Felos' puppet. Greer's actions, of course, are not excusable but he could probably work out a decent plea bargain if he plays his cards right.