Jon Favreau, Kenneth Brannagh, Joe Johnston, Louis Letterier, Joss Whedon, Alan Taylor. NONE of them were B-movie directors, all of them had ample experience with medium to big budget action movies and/or tv shows (varying levels of course).
Whomever they hire, he will know the score up front. Fairness wont factor into it. And even if for some reason, Whedon ended up taking the reigns mid-production, it would be out of necessity. The "feelings" of the original director are irrelevant.
Texas Chainsaw was an important film, Salem's Lot scared the crap out of me as a kid, and I'm one of the few people on the planet who actually enjoyed Lifeforce, but Tobe Hoopers body of work suggests that he was waaay over his head directing Poltergeist and likely needed the "help" that Spielberg provided. Kudos to Steve for being classy and taking the blame for the situation.
Either way, its not an analogous situation. Too many super-talented people involved in a production like this, and too much money involved.