I have mixed feelings about this. I'd certainly agree that the DDA is more important than full pints. On the other hand, if CAMRA gave up on all the campaigns which I personally think are stupid, they'd no longer have a reason to exist :)
As I understand it, CAMRA's main credo seems to be that "real" ales/ciders are intrinsically better than "fake" ones, so people just need to try them out to find what they've been missing. Personally, I drink mass-market brands like Strongbow because I actually like the taste of them; I've tried the "real" versions, and I can stomach them (unlike coffee), but I've made an informed choice to avoid them. Consequently, CAMRA's goals seem like snobbery, so I don't have any interest in joining them.
Stating the obvious, I think the best way to contact CAMRA is directly, rather than via LiveJournal. While I don't speak for them at all, I can guess at a few possible policies from them:
a) We are focussed on the things that are directly important to us, trying to change the rules, and we'll let the police/councils enforce the laws that have already been passed.
b) We're already addressing this, on behalf of our disabled members. (Page 12 of Saving your local pub
refers to the DDA.)
c) We don't have any disabled members, and we want to preserve traditional pubs the way they are. (See Pub Preservation
Are there any specific pubs you have in mind which don't have disabled access?