They will all come around and accept it eventually. It is not like they have a choice. Once it takes off a lot more and more companies like Dell have accepted it, they wont be able to resist.
We'd certainly like to think they wouldnt have a choice or that they would be forced to accept it, but it's not a certainty. People don't realise bitcoin could disappear quicker than it came if something better comes along or governments start cracking down on its use.