I've posted this once before, I don't know where, maybe in this thread, but this has always been my idea for the ATP season.
Create 4 even seasons-
-Clay, grass, outdoor hardcourts, indoor hardcourts/carpet
-Each season has an even number of Master Series/500s/250s, preferably something like 2 Master Series/3 or 4 500s/4 or 5 250s. At the end of every "season" the Grand Slam of that particular season's surface would be played (obviously Roland Garros for the clay season, Wimbledon for grass, etc)
So what is the Grand Slam for the indoors season and where it is played?
-Remove appearance fees. Use this money to create some kind of prize money for the player who did the best during a particular season prior to the Grand Slam event (similar to the US Open series bonus)
Appearence fees were technically forbidden, but such rules can be circumvented laughably easily so it's pretty pointless. There is no realistic way to get rid of them.
-The Tennis Masters Cup (YEC) would be played at the very end, after the last Grand Slam obviously. There wouldn't be any major events between the last GS and the TMC. Players should have 2-4 weeks to rest/prepare.
It's one thing to have offseason to reload your batteries, but players don't necessarily like such long pauses between events. It means that they have to keep training for "2 to 4 weeks" for just one event. It's pretty boring and tiresome. Nowadays there is one week rest pause before the YEC, and some have complained that it should be eliminated.
I think this would help bring more tennis fans, make the season less confusing (I mean seriously, clay prior to 2 big hardcourt Masters series and clay events after Wimbledon and prior to the hardcourt season? What a joke),
Whereas the spring HC season is pretty pointless in itself, IW and Miami are some of the best estabilished and most valued events on the Tour. You can't just wave a magic wand and make them disappear. IMO, IW and Miami should be changed to green clay. It is popular surface on US, it is traditional for springtime (though not many events are left) and better for the players physique.