The bigger question for me is what would have happened if Sky brought Wiggins?
Looking at this year's route,Wiggins should have been the guy at Sky. With the early stages looking more like spring classics than the traditional Tour flat warm-ups, (including a stage of cobbles) Froome was always in doubt. The guy's just not that great a bike handler, and he's fragile- neither of which problem applies to Wiggins.
That said, Wiggins is slightly off the climbing pace he used to have, so if it came down to a fight in the big hills, Nibali would have it over him, but Froome might have been able to equal the Italian.
The other factor is that Froome might be the team's mainstay for a few more years, but Wiggins is on the wrong side of the age slope these days.