I have one that loves it, but only hunted two days this year.. one with me.. college and work cut into his hunting a lot.. I have another that could care less.. I exposed them both to it early.. had a lot of success on youth days.. one took to it.. the other didn't .. they are individuals and you can't force anything on them..
I know I went through it myself.. after college I moved to AZ for 6 years.. didn't even have a gun out there (yeah stupid I now.. should have been hunting Merriams and Elk and Muley).. was more interested in starting my career and chasing let's call it "love"
.. I came back to it though.. would always fly home to Deer hunt and my last spring out there I flew home to Turkey hunt and fell in love with it again..
Just keep asking him to go.. that's all you can do man..