So far both of my children never lost interest in breastfeeding. With my daughter we did get down to only 1 or 2 feeds a day. She would miss feeds due to being distracted more than anything, so if we were out & about she would not be interested & also for us the breastfeeding was closely associated to sleep, so when out & about, she would fall asleep via pram/car trip, therefore miss a feed. But back home & nothing much going on, or me sitting down in the usual feeding place, then she would be very much interested. I actively weaned her at 2yrs as I was over it, felt like she was never going to lose interest and we had pressure from my husband to wean.
My son is currently still breastfeeding (23 months) he has probably been a little less dependant on it than my daughter was. For the past 6 months has been down to only 2 feeds at most and declining. We have started to have stretches of 1 feed in 48 hrs, but he has never gone more than that, at some point he will ask or I will feel a feed will get him to sleep. Again the missing of feeds is more likely to occur due to distraction & same as my daughter, falling asleep via other means, but with my son, he will often go to sleep being read to or just laying down with him.
I'm the opposite of you and wonder how do people have kids that self wean at earlier ages like your son.
Breastfeeding can still be a very useful tool for me, and he is still getting a lot of nutrition & health benefits, so I don't really want to lose that. My husband has been much more relaxed so far about it all, but then other times I think we could manage without it, so I am confused as to wether to just let him self wean which could still be a while or to instigate full weaning myself.
So after that long ramble my answer is, it is really an individual thing, and like in everything child related, they are all different and if left to it, they do it in their own time so it varies a lot.
If you want to keep feeding then all you can do is keep offering when he is interested/asking. All the best, I hope he does keep feeding, as there can be great benefits for you both.