It might indeed have something to do with his break. Maybe, before stopping, he intends to get as much out of himself as possible, postponing everything until that break, and then it's on to something completely different. He says he wants to be more than just a singer, and rightly so, because he is capable of much more. I just hope the break won't come too late. He seems to let himself getting swept away by this huge success, and he is really probably enjoying himself immensely at the same time, but he's also pushing himself.
But singing is not just fun and games, it is like sports, a very pshysically demanding activity. And when you're in your thirties, slowly and gradually, things become harder. Not that you can't do it anymore, it is not even harder to do it at the time, especially if the audience goes wild and you get the adrenaline flowing, but your body takes more time to recuperate. Any athlete knows that and starts to take it down a nodge at that age.
These tours are too demanding. It's one day on and one day off, but if that day is used to travel, than you can't rest properly.
I must admit, I am becoming a little bit worried. (And now I am REALLY beginning to sound like my mother...which is of course far more worrysome...)
Edit: typo's. (Due to old age, perhaps.)
Edit 2: Just read the topic on radio broadcasts: apparently he has figured out he is not twenty anymore and needs more rest because this life is getting a bit too much for him. Well, that is one less thing to worry about.