Remember that the Rafole rivarly sets the tennis standards these days and unless you got a 30+ rally in every single point the quality of a match remains awful. Aces, winners and fast exchanges are unacceptable.
Yes, they don't belong on a court like this. Doesn't suit them. They wouldn't care. It's like the indoor season in the fall. Just give them a court like Miami, Indian Wells, Rod Laver and all of the slower playing courts and let them slug it out from the baseline or further back till they drop. Trouble is, one or both just might soon, and that would be sad.
They don't need a shorter schedule, they simply need to play on more varied surfaces with a preference toward faster playing hard courts, which is the most damaging to the players joints. They (all ATP tournament officials and players) have to realize there is a benefit to playing on a variety of paced courts.
It means that the same players won't have to go deep in every tournament, but they still have a chance of getting a few points and cash. Points, games, and matches will be shorter on the faster more damaging courts, their bodies will thank them for it and they might be able to last the whole year. More forgiving courts like soft clay can stay slow. And you will see different players going deeper in tournaments because they will be able to find a surface that suits their play.