These house Dem's are not fools, they'd like to keep their seat through the next election cycle. If these 65 continue their opposition and all 178 republicans oppose it (if itever evencomes up), then Pelosi would not have the votes for passage.
I don't see the AWB coming up until after the midterm election, orpossibly not at at all during BO first term (hopefully his ONLY term). I do sense that between now and then we'll probably see several trial balloons to gauge public reaction on several gun control measures. The Brady group is very well fundedand too entrenched in the Democrat party for the Dem's to just ignore their lobbying efforts.
Eventually these 65Dem's will be pressured to change their position. Just like the new Senator from New York that took Clinton's seat. She had a fairly solid 2A record, I'm not so sure any more given her recent comments. Wether enough cave in is yet to be seen.