I'm thinking there should be a rule made that rackets must have as many cross strings as main strings. The game is already getting so much like ping-pong (table tennis) now with the heavy spin and baseline rallies. More spin will even lengthen the rallies and make the points more and more like a Harold Solomon/Eddie Dibbs matchup on early 1980's clay. Offensive tennis will not be rewarded and a game of attrition will result.
They did put a limit on racket length and golf just changed the rules on putters; it can be done.