Erm, the McGann thing wasn't a film per se. It was supposedly a feature length episode with an option on a new series to follow. In light of how bloody terrible it was I was very glad the option was not taken up.
Likewise the first two films were disasters. Quite appart from their being terrible films, the whole "reimagining" was nonsense. The idea of the lead character being a human being who happened to be a Doctor who's surname was Who was truly ridiculous.
I actually think the idea of the proposed film is fundamentally flawed. It could have worked back in 2004 before the new Who came along, but we are now six series back in. The series is firmly established in the public consciousness. Any film that is not part of the canon will no doubt be seen as disapointing by fans of the series. And any fans who are introduced to the series by the film will no doubt find the series disappointing as it will have little connection with the film. As such it can only dilute the brand.
Unfortunately I don't see anybody having any reason to make this film other than trying to make money in the short term. Just because somebody wants to pay for the movie rights that doesn't mean the BBC should sell them - they need to think of the long term strengh of the brand rather than making a quick buck. Badly managed something like this could harm the brand and kill the goose that laid the egg in the first place.
Likewise just because Who is a huge hit on British TV and a minor hit elsewhere that does not mean it's popularity will translate into big cinema audiences. Obviously any project like this is going to end up being big budget. There's no way they can take it back to the sparseness of the sixties given the way the series has developed. Yes there have been lower budget episodes in the new who, but much as I loved Blink I don't see that sort of story being a big box office draw. Any Doctor Who film these days will be big on action, effects and budget. As such it's going to have to have big audiences to make any money. TBH, much as I love the Doctor old and new (with the exception of the 7th and 8th Doctors) I can't see it doing big box office. And again I don't think that would be good for the brand.