I still say only one or two riders would finish
Stage 1 - 220km over rolling terrain with wind, and intermitent rain. How many riders would finish outside of the time limit??? You could probably wipe out 25% of the field straight off.
None of the big riders would be able to ride well every day, the nature of time trialling means you are using a lot more energy and everyone would have a few bad days.
i would guess that by the end of the first week we would be down to 6 or 7 riders.
By the middle of the second week we would be down to maybe four, Wiggins, Cancellara, Contador, Evans, and then by the end of three days in the mountains there would only be 1 or 2 left. The final ten days would see two riders battling it out.