Golfman25,
My two cents...I've been through 3 baseball sons. They are all different, and had different tolerances for baseball. Your son is in 8th grade now, and making more choices than you probably realize. He is growing up, and trying new things. Let him choose his activities when he earns those activities through his grades and actions. Young adults need mental stimulation in different forms, and sometimes they get tired of specific sports that are not in season. If he is getting good grades, and not a behavioral problem let him do his thing. JMO.
I've talked to a bunch of baseball parents today at a camp/showcase. Every parent mentioned their kid was tired of baseball right now, and needed a mental and physical break. I know my son is looking forward to a break as he has never had a season this long before. This is my son's last weekend until he shuts it down for 6-8 weeks on the mound. I know he'll be chomping at the bit in 6 weeks to play catch.
Good luck!