Whatthehell - This thread seems to have gone a bit off piste, but I wanted to try and respond to the original post. Sorry if I miss any of your further comments down the thread - I've tried to read them all but might have missed some in the melee.
As you can see, breastfeeding is an emotive issue. I made totally different choices to you - home birth, extended breastfeeding. I am very pro breastfeeding, but I respect every woman's right to make her own informed decisions.
Thinking from your husband's perspective, I suspect he may be feeling shut out and frustrated. This baby means the world to him and breastfeeding is obviously something he feels strongly about. But it is a decision that is out of his hands. It is (quite righty) your body and your call. It must be very hard to realise as a father that in the early days, it really is the mother who shapes things (birth, feeding) if you are used to an equal partnership. I felt the same way in reverse with the crushing realisation that I was the one sitting at home covered in spit and baby poo whilst DH's world still involved interesting conversations and sandwiches from Pret! That may sound like a silly comparison, but if you're in your late 20s/30s with years of equal partnership and equal careers behind you, understanding the (for want of a better phrase) power shift that takes place in a relationship around children can be really hard. Finding your feet as parents can be tough, and maybe he is pushing you so hard on this because he does want everything to be equal. Long term, this is a good thing for your relationship, you just need to get over the feeding/birth bump!
I think perhaps trying to convince him with facts, or reasons, or reminding him of that fact isn't the way to build consensus. I suspect maybe his continued pushing has made you defensive, and him more entrenched.
Have you tried sitting down with him, acknowledging his feelings, stressing your own and talking more generally about being co-parents. How about asking him to hypothetically accept your decision - then think of all the nice things that decision would allow. I know it's a cliche, but shared night feeds is an obvious one. Talk about the bigger picture - all the wonderful things on which you agree about how to raise your child.
Also, feel free to tell me to naff off, but if you agree to feed colostrum you may find it easier and less stressful to do it directly. Doesn't stop you moving to formula whenever you choose. I only mention this because I have a friend who did this, and the tiny quantities make it really difficult, fiddly and frustrating in many cases to express colostrum. I'd be careful of making promises you may regret to express it, and personally would go with either feeding it direct (your milk will come in whether you do or don't , so it won't make much difference to drying up your supply), or making only very tentative promises to try and express it. I wouldn't want it to become something you agreed to keep the peace, but then became a source of dispute later on.