I voted for Maybe, it depends.
First, off I would want the movie to be fairly soon after full house ended, in late 1995 or 1996. I wouldn't want a movie set during the show's run for the reasons that csoup mentioned. Nor would I want a movie that is too far removed from the series, as it would be too different from it.
Second, I would want a Full House movie to have plot material for each character, although It wouldn't have to be 1 plot involving the whole family. What I wouldn't want is an Episode that focuses on 1 or 2 main characters, say Michelle and/or Jesse, or Michelle/Joey with a lot of the other characters only having smaller supporting roles. I also wouldn't like it if they decided to feature Nicky & Alex on account of them being old enough for bigger speaking roles.
To put it bluntly, I wouldn't like it if DJ and/or Stephanie were shafted in terms of plot and lines.
Thirdly, I wouldn't want a movie where they find some excuse for the whole family to go on a vacation (like Danny's & Becky's show, or Jesse's band ect.) While vacation episodes did work as part of the series, I wouldn't want the only appearance of the Tanner Family on the big screen to be set anywhere other than in San Fransisco.
There's a bunch of other things I wouldn't want as well.
- The katsopolises having moved out before the movie begins.
- DJ being away at college and not in the movie.
- DJ & Steve getting married
- Kimmy & Duane getting married
- Joey getting married
- Major accidents involving any of the characters
- Major roles for any of Michelle's friends
I would be fine with the following:
- DJ & Steve moving in together
- Kimmy & Duane moving in together
- The Katsopolises moving into their own house during the movie