If Froome keeps this lead all the way to Paris, without having a bad day or two and losing some or even a lot of his lead to concerted attacks, I might normally be very suspicious indeed. But the thing is that none of the current top 10 have got much in the way of an incentive to change very much for any reason other than personal pride, with the exception of Kwiatowski and Péraud. Tinkoff (get used to the name...), Belkin and Movistar all do very well out of the current situation in terms of World Tour points (better than Sky, in fact). It would make more sense for all of them to play it relatively safe, control any attacks from lower down the field and keep their own attacks in the mountains strictly last minute for stage wins (a Quintana speciality). I don't think Froome needs his own Sky team to protect the current standings...
So I'd watch out for the biggest efforts to shake up the GC coming from Kwiatowski and Péraud, Rodriguez in 11th and Moreno in 18th (Katusha's highest placed riders), Fuglsang in 12th (ditto for Astana), and especially Nieve and Anton for Euskaltel in 15th and 20th, Poels in 23rd for Vacansoleil (all of whom may need a new team in 2014). I'm not sure about Niemiec's form for Lampre, but I can see him going for a stage in the Alps at least.