I get the feeling that the switch back to track is just another excuse for Wiggo. After Beijing he had three Olympic golds and six rainbow jerseys, which is everything he could have hoped for on the track barring the individual pursuit world record, and even without that he was clearly the best pursuit rider of his generation. With the IP gone from London 2012 it made sense for him to ditch the track and spend the rest of his career on the road, and for a while it looked like that was his plan.
2009 was obviously a great year for him but 2010 was a huge let-down and I think he would rather run back to the comparative comfort of the track than tough it out on the road. It's not as though Team GB is short on guys for the TP squad. Using 2012 as an excuse to not really try on the road is a big mistake, it puts a ton of pressure on him and if he doesn't lead the team to gold next year he is going to have effectively wasted more than a year of his career.