I don't know about that, but my first nursed until 2.5 too, and it wasn't working out for me so well anymore. It was time to wean (since nursing IS a relationship, it needs to work for both involved...and it wasn't working for me anymore!). In case it helps, I'll share how I weaned. I don't know how often he's nursing right now, but I cut all nursing down to just sleep times. She could nurse right before. Then it got to where she could only nurse for night time sleep. Then sometimes we skipped that. And then gradually it just ended.
As I'm sure you know, the less and less you nurse, the less milk your body will make. So, by the end, my daughter was hardly swallowing because there was very little milk. Luckily she didn't really care a whole lot. She seemed to be nursing more out of habit than out of nutrition at that point. But if she were to insist upon nursing, I would have redirected her, given her a drink or something else.
You can definitely wean him. He might not like it, but come up with what you are okay with in your efforts to wean (such as no nursing unless it's before bed, etc. Then after a while, only before nighttime bed and not at all during the night, then every other nighttime, then less and less, etc). Figure out what you are okay with and stick to that. He might protest, but it sounds like you are ready to be done, and it's really okay.
I don't suggest cold turkey. That might too be sudden and emotionally be upsetting to him - more than it needs to be. I'd take it gradual and have it be something that happens over a month or a few weeks or something.
Good luck! Oh, and yes, your milk supply doesn't necessarily continue on, it's more like it sits there waiting to be used if it needs to be - it's something you can start up and get going if need be. But you likely won't have boobs full of milk. There won't be much in there at all. But if you had had a well established milk supply, your boobs will be ready to start making milk whenever you need it. My midwife still had a drop of milk in there a year after nursing. She definitely didn't have a full supply, but there was a tiny bit of milk!