All it would take for SV to make a comeback is to somebody (preferably american) to win wimbledon or the US with a hybrid baseline and net game and SV about 25%. Sure racket technology and strings are beneficial to baseliners now, but in 10 years time somebody could make a string the can compeltly kill all spin and create perfect drop volleys 9/10. What would everyone do then? start playing the net of course!
People play the way they have to to win. You hear people say 'well Borg and Agassi won wimbledon from the back', well that's just a load of horses ass. Borg came forward on nearly every 1st serve and at least 50% of second serves. And when Agassi won, he serve and volleyed on a lot of his service points and finished a lot at the net!