I think the management of Sky has realized that unless a route similar, or even easier, than the 2009 TDF is created, then Wiggins has no realistic chance of winning the TDF. Even if a 2009 route is created then he still can't win unless Contador is absent...Considering they are designing the routes to increase Andy Schleck's chances of winning, such a route is not very likely. So I don't think you should worry too much that Uran and Henao will be domestiques.
Can't imagine any other brits being able to do it either, although I'll give Peter Kennaugh a small chance if he starts improving massively very soon.