Hitch is right course the 100 edition is better, not by much but its better, compare it to winning a Gold in olympics in London for Wiggins or Brazil im sure you would rather it be at home, and if you asked Contador last year to pick his 1 and only remaining GT win, it would be "100" Editon of the TDF.
Do you lot think if he does not win it next year and say comes 2nd at Vuelta(which would mean we would say imagine if he did not do the Tour he would have won) he will then think hey may aswell do Giro/Vuelta for 3 years see what that brings? I personally think he should do that next year i honestly think he will always be known as a great weather he wins another TDF, i believe if he is in Vuelta a Espana 2012 shape(which was not vintage AC by any means) than that would win him another 2 Vuelta's he should go or the legend that is Robert Heras record of 4 it would be better to see the Vuelta have a 5xChanpion instead of just 4 it would help move the Vuelta up alittle bit aswell as its always looked at as the neglected GT.
Can he still contend with say Quintana and Froome uphill in your opinions?, i no it may sound a silly Q as were still in 2013 but its weather or not he can still stay with the top guys, next year in early races like Paris Nice will tell me all i need to know if Oman and P-N are like Oman and T-A last year and he keeps gradually losing time, we know its not a case of his shape its the face he does not have the real big GC men ability at this stage of his carear(not that its bad he had alot of top 5's)