Personally I can see Djoko stunning Rafa at his favourite tournament in RG this year to take that crown, but I think he'll be mentally exhausted after completing a career slam and beating Rafa there that he'll get knocked out very early on at Wimby to a Tomic or a Harrison or a Raonic (if the draw is good).
My bold prediction of the day.
Ive hoped for the same myself.
Nadal will make his last stand at RG and even if he wins both Novak and Nadal will be there for the taking.
Nadal has completed the channel slam before, but he always had the benefit of no resistance leading up to the final.
Its up to Andy to have the balls to go for it, although it might be Federer or some other numpty that takes advantage.
And we have seen how well Fed can take advantage of good luck.
If Nadal loses I think he might be near to retirement.