It is fairly obvious the promoters of the game want Djokovic to win the most slams from here, mainly since he is behind the other 2 now and they want a 3 way fight for the slam record for promotional value. And possibly at one point a 2 way fight for it between Nadal and Djokovic if possible, considering Federer who is much older is most likely to retire first. Lets face it, once the Big 3 are gone, the ATP promotional machine will be on empty, they will be racking their brains for ideas. They will be reduced to things even more cringeworthy than the lame-o New Balls campaign around 1999/2000. So they will try and milk the very last thing they can out of them, and that is the overhyping of the slam record to unreasonable heights and heavens. The ATP and ITF have both always been a business, nothing about fairness, all about money.
So that said Federer and Nadal meeting again, not that unlikely. At the very least it will be aided by their inevitably being placed in each others halves to aid Djokovic (what they used to do for Nadal) more and more often.
That is a reasonable assessment of the dynamics on the tour at present. The main problem arising from that is that as a result of that policy the records set will be that high that no one can even start thinking of breaking them for a while, and that would leave the the tour without a purpose for a
very long time. When that happens drastic changes also inevitably happen.
When Laver did his heroics in the Pro and the beginning of the Open era (well, it was only on paper Open era, the changes didn't have the time to have any effect when Laver achieved his Opus magnum, so it was still the same players, just with the promise what is to come in foreseeable future) the field was opening up for the competition, so the expectation about it kept the tour going.
When the generation of Mac, Borg etc was starting to go away the racquet technology change happened (well, except for Jimbo, who was somewhat of an early adopter of technology different than wood), and that introduced a brand new expectations about the future of the sport.
When Edberg Becker et started to go away in came the athletic and fitness revolution, along with some racquet technology changes. That didn't go down as that much of a change, but by that time the records from Laver's time had a completely different context (Open era vs Pro/Amateur Tour), so there were records to be set. The same trend kept the the tour going, with Sampras and Agassi chasing the Open era records of the Open era ATGs.
Now, with the setting of the records on that level, the tour will have a hard time transitioning to new horizons: the Open era has long served its purpose, the racquet and string technology's major overhaul happened around 1998-2002/3 and the medical and nutrition advancement has been as drastic as anything out there. There are no tools that can shift paradigms on the horizon.
