This is a great summary of the thread and @biglipslittleblips responses.
I think OP asked twice if his desire would 'just go away one day', almost like a question to the sky (looking upwards) and , to me, it seemed it wasn't really a question, more a musing.
I'm sure OP can go to his GP and get a drug of some sort that squashes libido.
So that's the solution?
The style of OPs posts ( in the third person) and the lack of emotion in them (or the lack of writing about emotions) does indicate that there is an outpouring of stuff inside him that he can't discuss with his DW. Some are almost bullet point.
This is the fact. I can't change it. What do I do?
Then suggestions are batted away, which is fair enough as the solutions aren't palatable to him and the risk of meeting his sexual needs outside the marriage could end up blowing up a very good long term partnership.
First (bullet point!) . Talk to her about how you feel OP. It may not be that bad?
Second (after doing the first) sort out some couples counselling (as suggested earlier in the thread) and, no it won't be nicely nicely , it'll be hard but your current situation is hard so may as well.
Third; consider this. Some couples just gel and a co dependency develops ( nothing wrong with that if it works for both ) but sometimes it can become a strange situation whereby one partner (or both) sort of becomes a parent to the other. Loving, caring, emotional safety and so on.
This is a nice way to live, like existing in a safe cradle but base human desires are hard to suppress forever.
And your question raises the dilemma many face (often unknowingly).