Honestly, men like beautiful women and women like rich men. Even if your wife is okay with it, it could be a hit to your attractiveness. It also means no more expensive gifts.
But otherwise, I have taken year long breaks from tech. There was no issue with being outdated; if you're the type to hang out on HN as a hobby, you should be fine. Interestingly, going back and looking at old code gave a lot of insights to what I was doing wrong.
The only issue I had was losing momentum on networking. If you go around rejecting work, they find someone else and people stop recommending you.
Also as someone who has taken a year off, I find that breaks don't cure burnout. Burnout is caused by not having an impact despite hard work. You probably won't have an impact on anyone's life by being good at hiking. It was teaching that brought me out of burnout.