I completely disagree. There are plenty of wrestlers who have been able to maintain that sort of schedule at that age. Being close to 40 myself, it's not like there is some magic age that comes along and makes us too old to do anything. I hit the gym 7 days a week and very few younger guys in that building can come close to what I can do on treadmills and ellipticals. Ric Flair was 44 in the WWF and had that sort of Schedule, as did Bob Backlund. Kane is 47 and he still is wrestling. Even if he isn't full time wrestling, which I assume he is because he is wrestling at the house shows, he was 45 during the Team Hell No run and was wrestling full time. A guy in his 40's and 50's who takes care of himself is completely capable of working a schedule like that. It depends on the wrestler who is 44, not the 44 year old wrestler.
I think Bubba would be able to keep the schedule just fine and would love to see him full time in WWE.