Re: How long do you think it'll be until we have a year with 4 different slam winners
2014 Djokovic and Murray will be on serious decline and Nadal almost gone outside clay. We'll see if any dominant force will appear, I expect it to be a super bad mini era like the one from 98-02, old legends winning one slam here and there, very avarage youngsters collecting the rest. A healthy Federer at 33 will also ofcourse be in good spot to sneak his way to win slams from the likes of Tomic, Raonic and company. Maybe some slam like the AO will be to old Federer what it was to old Agassi.
All things are subject to interpretation whichever interpretation prevails at a given time is a function of power and not truth.