Puggo - Jar Jar's Yoda said:
Makes me wonder if I should be bothering to worry about people who don't have remotes.
I think you answered your own question ;)
I've never seen a DVD player that didn't at least have a "play" button on the front of it, so neg's buddy seems to be in the vast minority (of an already "no remote" minority).
If anyone is really worried about it, you can link them to DVDShrink and they can reauthor it to autoplay with whatever audio they want.