Not really. His success only means that when the entire top of the tour is past or approaching 30's, the injuries will pile up, the voids will be created and eventually someone will take advantage of them. Like I said before, "ageing" is not exclusive to tennis. It's happening in many sports. It's happening in life in general, too. Unless proven otherwise in the next couple years, he's the new abnormality, not the norm.
BTW. that still wasn't Zverev, who snatched 3 GS this year. Guys over 30 did. In fact, in both AO and RG 3 semifinalists were over 30. In Wimbledon 2 were over 30, 1 was almost 30 and the last one almost 29.
Aug, 14 2000: 3 players over 30 in top 30. Including ATG Agassi on top. 14 players under 25. Average age: 25.06
Aug, 17 2009: 3 players over 30 in top 30. 15 players under 25. Average age: 25.5
Aug, 12 2013: 6 players over 30 in top 30. 8 players under 25. Average age: 27.17
Aug, 14 20017: 14 players over 30 in top 30. 5 players under 25. Average age: 28.53
Looking at 2013 is kinda funny. Not a single player in top 30 has retired yet. Tommy Haas sort of did, but then he came back for another round (and even kicking current world #3 left, right and center!
). But let's say he did. The rest 29 players, who were not spring chickens to begin with, if compared to previous generations, have not retired in last 4 years, and just a couple dropped in ranking significantly. It has nothing to do with Raonic/Dimitrov/Nishikori not living up to the premise. The old guard just refuses to retire and the newcomers are not strong enough to force it.