OP, as someone mentioned upthread, if you want to give up nursing your child when they start solids, then you will need to put them onto formula until they are one yr old. But you don't want to feed them formula if you can help it. Well, you can't have it both ways, so need to work something out. And plenty of women express milk when they go back to work (it's illegal to not provide you with a space to do it in and a break to do it in, I am led to believe).
I am confused by your posts as to whether you are TTC, pregnant or have just had a baby, but honestly, just concentrate on the here and now when you have it, if you've not. Seriously, it will be such a big shock, you will struggle to imone what you're going to have for lunch, never mind mulling over Bfing a toddler!
And it is lovely, btw. When they can actually ask for it, it's very sweet, not weird at all. When they do silly Bfing gymnastics, it's hilarious (don't let that put you off further, oops!). When they express their devotion to boobs and breastmilk, it's wonderful. Even if you end up having to pretend to breastfeed Thomas the Sodding Tank Engine. And when you see it helping or healing them when nothing else does, it's amazing. Not that you can't help your child without Bfing, but it is great stuff, honest.