keep in mind that the Big 3 were helped immensely by:
- surface homogenization
- lack of equipment regulation, i.e. ever stiffer rackets with bigger head size, poly strings
and then ATP and ITF decided to change the balls as well, and change the grass at Wim
and as well scrapping the indoor carpets
so, all in all, same baseline play is now the winning strategy for every tournament, every surface
that's quite different to the past, when clay required baseline play, while grass demanded S&V, and there was a variety of fast and not that fast hard courts
if one day ATP and ITF will see that people are bored of the countless defense botting in tennis, and they will bring back some variety, or add some limitations on equipment, it won't be that easy for 1 player to dominate 11 months of tennis during 15-20 years