Sure there will be some that will wait. But waiting puts you almost a year behind everyone else. And while your building your season 2 heroes. The newer/(assuming) better season 3 heroes will be taking over.
In my mind, more people would be upset that it doesn’t happen than people will be upset if it does. By the time the camp is released and leveled the PTP/CTP will have many of the heroes already leveled while FTP are just getting a “chance” to train them.
By then as you say season 3 may be starting and they will be moving on to the next new thing and will have even less concern over them being available to train.
In my mind it makes the most sense for the community as a whole and for SG to be able to keep the game alive, semi-balanced and growing. But I may be completely wrong and it may never happen.