J.M.
That's a personal choice and I'm a new mom, so I can't really give my own advice or experience. I have a girlfriend who was in a similar situation and she chose to ween her son and she's also due w/ another child. He was at the age too where he was actually begging her to breastfeed him, probably for comfort so they knew it was time. They started by weening off night feedings, letting him spend the night at his grandparents for three days. You may also want to try a nearby support group if you can't find the answers here. I went to my first support group today and found it helpful. I heard one story today where the mother put bandaids on each breast and told the child that her milk machine was broken. I'm sure in time they find another way to comfort and would probably forget. Again, I'm not sure that I could help you, but I just joined Mama Source tonight after hearing about it at the support group at my hospital and your dilema sounded like some I've heard. So you're not alone if that helps too.
As for you only being able to nurse one breast, they covered that in my support group too. Some women choose only to nurse one side and let the other dry up. Honestly, my right isn't making as much as my left due to a car accident injury a few years back. But I'm not ready to give up as I really want to nurse. I'm trying to increase my milk supply in both breasts.
If you're interested, the support group I went to seemed really helpful and it's called Mom and Me. It's in Westlake on Center Ridge behind St. John Westshore. I may go to the breastfeeding group on Wednesday's, but I attended todays group which seems to cover all. It's from 1-3pm, atleast the Thursday group. If you need more info, feel free to contact me. Everyone was really nice and it felt good to be around others that understood and either are or were where I am and also to learn more about what I might expect down the road. Congrats on becoming a mom again!