I haven't seen a different attitude of many cyclists so far this season. Cancellara, Boonen, Gilbert, Wiggins, Nibali, Cavendish, Freire, Sagan, Joaquim Rodriguez, Cadel Evans, etc are all riding pretty much the same program as last year.
Of course most of them will ride, it's not like there's another race going on at that time and they all want to experience the Olympics at least once. Does it make the race more prestigious? Don't think so. I'm pretty sure this year's Olympic champion will have been on the podium of Milan-San Remo in the past.
Guys like Wiggins and Evans only ride the road race because they want to do the time trial.
I mean, is there anyone here who really believes Samuel Sanchez is more famous than Mark Cavendish, Alberto Contador, Cadel Evans, Fabian Cancellara or Tom Boonen?