It's not really that simple. The last day of competitive GC racing is an individual time trial, so no matter how things are lying at that point, both Wiggins and Froome should be going all out.
We know that although close, Wiggins has the slight edge in the TT, but it could be very interesting if for example Froome was sitting in yellow by 20 seconds over Brad, going out last and getting the time checks, to see what orders came over the race radio in the final km.
Do we think it's a possibility that should this be the case and Brad was virtual yellow, Froome might be asked to ease up and slot into second?
Personally I'd like to see both men fight it out over the TT and the best man wins... However it's a moot point at the minute until we know the standings on the start ramp