Changes are not always good nor always bad. They should be made when all factors have been taken into account. I don't know for sure if a format similar to 4 Grand Slams would be good for TT, but I definitely see many advantages.
And if you've already gotten into comparing TT and tennis to football, here's another thought:
One huge flaw in football in my opinion is that many match-ups between the best clubs and players in the world rarely happen. And how would they? there is only one event every year that could lead to a match between, say, Barcelona and Juventus. There is so much room for improvement there, which would take better engineering of the competitions. That too requires changes.
The state of things in TT and tennis is much better in that regard. Top players play each other all the time. Their time at the top of the game is limited, so why not do everything we can so they are celebrated as much as possible while they are here?
How many finals have Ma Long and FZD played against each other in a WTTC or the Olympics? Just the one. Ma Long against Zhang Jike? Just the one as well. FZD against ZJK? That ship has already sailed.