Hiya Steve - unfortunately, I already assume any movie will not be SHADO as we know and love it.

Though, that is not necessarily a problem for me if the writing is good, the plot is gripping and the actors can act! In fact, I don't really want Straker / Foster / Lake et al re-imagined because the show can't be the way when I was fresh to it 40 years ago.
It's nice that Gerry Anderson is a consultant of sorts, but I can't see him having much say in what the script does - or anything else. Does he still own rights to the show or characters? How often do we read about fairly clout-ful directors and producers having to bow down to the Powers That Be (mostly accountants) at the studios and being forced to change characters / re-cast characters / re-write scripts / slash budgets, etc.
I don't hold out much hope for the movie... but otoh, I did enjoy the Star Trek movie so it can be done. I'd love a story where a young Straker and Freeman (and Henderson?!

) first get together to kick ass... but as Foster has already been cast (iirc) I doubt that'll happen.
And does the original fanbase
really matter? I'd like the answer to be yes but are there enough of us to make or break a movie's success? I don't think so. Sadly. I think the DVD sets sold fairly well but how many of those purchases were just because it was old sci-fi which had a good reputation and the price was right?