First let me admit that I'm not the biggest fan of Deion. I agree with the earlier post that he seems to be all about himself. I think his track record speaks for itself.
I will admit that he has already accomplished more at Colorado than I thought (and probably hoped) he would this year. I'd say we'll see how big of a win TCU turns out to be at the end of the season, but coming from where Colorado was, I think it's going to be a big win regardless of how TCU turns out.
That being said, I still don't see it happening that fast at GT. Maybe eventually if he actually stayed around long enough. I'm fairly certain he couldn't have brought all of his "Louis" with him to GT. Could he have gotten enough approved to improve the GT product? Probably, but that's a pretty low bar based on the previous regime.
I feel like Deion would have tired of the GT environment pretty quickly and moved on sooner than he may at Colorado. For potential long-term stability (which should correlate to success), I think Key was the choice. For potential quick, big-bang impact with uncertainty in the near future, maybe it should have been Deion.
But I'm sticking with Key and giving him a chance to prove he was the guy.