I have posted on this issue before in the threads posted by a pp. I had this exact same issue with my DH. A few different thoughts come to mind:
(1) One of the thread deals extensively with the issue of DH feeling like he is not getting enough attention or time with you. Some guys may not even vocalize this issue but it is very common. My DH eventually did tell me this and said that he really felt that we never got any time to ourselves and our relationship was suffering. The real problem was that, for a period of a couple of months, our Eva would not go to sleep at night without nursing, and she would not take a bottle. This meant that we could not ever go on dates in the evenings.
My proposal to dh was that he was looking at weaning as a cure-all, but that it was not necessarily going to be effective and there were other less drastic measures we could take to address the problem. We eventually got DD to go to sleep without nursing and now we are able to get a babysitter and go out every couple of weeks.
So you might let your dh know that you are not willing to wean, but you are willing to look at other ways to work on issues that he is concerned about.
(2) I also told my DH all about the benefits to our dd of continuing to bf, and that the only way I was going to wean would be if he could show me that weaning would be what was best for our daughter. Of course, he could not.
(3) We also don't know many people who BF this long, and I told dh that I thought his opinion was being affected by fear of deviating from the norm or social criticism. I told him that I was not willing to put someone else's ill-informed opinion above what I knew was best for our daughter. I told him that I thought part of the reason he loved me was that I am not a conformist/follow-the-crowd kind of woman.
(4) This is the most important in my opinion. DH and I were making steps toward him accepting ebf for a while, but still he would make unsupportive comments that really upset me. Finally, one morning, I told him (without anger) that Eva and I really needed his full support. I told him that, even though I was not asking for any medals, I really needed his recognition that I had given so much of myself to do what was best for our dd. I told him that when he made critical comments, it hurt me so much because it disregarded and devalued the blood, sweat, and tears that I had put into breastfeeding. I tried to tell him this in a way that was simply asking for his support, but not accusing him of anything or putting him on the defensive.
Since that day, things have been a lot better. Although I still think he would be happy if we would wean, he is much less critical than before.