Contador announced last year that he would try for the triple (Giro, TDF & Vuelta in one season). Seems like it was Bjarne Riis (his team's manager) who had this idea, or at least pushed it and made it public. So in a way he's already committed to at least trying all three. My speculation: if he was victorious (or sniffed podium) in all three while clean, this would be so insanely impressive that everyone would forget about the TMI (tainted meat incident).