whenever someone mentions Murray, Tsonga, Gasquet, Gulbis, Del Potro etc. winning a slam, most critics say they lack the consistency. so I'm wondering, in 3-4 years when Federer is [mostly] out of the picture and Nadal is [possibly] burned out, who is going to be winning all the slams? even if Nadal is still in shape he'll definitely only be a threat on the natural surfaces, so whose going to be picking up the 2012 and on slams??