Well, count me as firmly entrinched in the no-flipper camp. If Universal is going to jump on the Blu-ray/DVD Combo pack wagon, then I would 100% prefer them to follow Disney & Warner Bros. example and include a separate DVD in the package with the Blu-ray.
Personally, I do like the idea of having both a Blu-ray & a DVD available in the same package as it does allow for more flexibility in the playing of the film. My household, for example, has mulitple dvd players (including portable ones) while we currently only have one blu-ray player. Before we had the blu-ray player, Disney's introduction of the combo-pack allowed me to start picking up the blu-ray version while still being able to watch the film with the included standard dvd. Even now with the blu-ray player, I still weigh whether to purchase the dvd or blu-ray version of the film, but having a combo pack available for the film makes it an easy decision.
But as to the idea of a blu-ray/dvd flipper, just don't like it. First off, I've just had too many issues with flippers. Granted those were with tv shows, not films, but still I can't say as I've really had any issues with single-sided discs. But even if we say these new flippers will play 100% perfectly, I still wouldn't like 'em for reasons that others have already posted about, namely smudging & scratching. It is just far too easy to get fingerprint smudges & scratches on flippers. With single-sided discs, you have a protected side to make handling the disc easier; a flipper eliminates this. Of course, as others have also mentioned, a flipper also eliminates disc artwork, which I do like seeing on my discs, although I see that as a minor issue compared to the smudging/scratching issue.
So, while I can say without a doubt that I would be purchasing Disney & Warner Bros. films on a Blu-ray/DVD combo pack, I can't say the same about Universal. I'd actually be more inclined to purchase their film on standard dvd to avoid the flipper and have a single-sided disc.