If people want to be worried about the future of Elemental, they should be concerned with Wardell and Kael since those two have much more input than Shafer will have.
The teeth gnashing is downright laughable. I uninstalled Civ 5 within two weeks of buying it and have told anyone who asks me about it that I think it is terrible, but that doesn't mean Jon Shafer is incapable of doing a great job in his new position.
not to be glib but: there's a reason why when they interview you for most white collar jobs they usually have a few questions that start with the phrase "tell me a time when..."
past performance is a good indicator of future results
civ5 is considered a failure in the community (though not with critics strangely) and it doesn't seem like they are taking drastic enough steps to fix what has been determined by consensus broken