In another thread I passed on a rumor I'd heard about the next movie being a prequel set during season 7. This rumor has been making the rounds for a long time but I have to post a correction. Frank Spotnitz has been quoted as saying that the new movie isn't a prequel, it takes place after season 9 and it involves Mulder & Scully pretty much stumbling into an X-File even though they are no longer in the FBI.
Anyways, my point is that setting it during season 7 would have allowed them to bring back a lot of the dead characters and in the case of the Lone Gunmen a big-screen appearance would certainly help get those figures released but the odds of that are looking pretty slim.
Of course, they could always do a cop-out "they didn't die after all" story (which I'd disagree with, their deaths were actually very touching), they could go the "Scream 3" route and have them appear via an "if you're watching this I'm already dead" video tape or they could simply do an old-fashioned flashback.
I'm not holding my breath for the Gunmen to appear in the movie but I just hope the movie renews interest in the show enough to breathe some life into this line. I don't think doing characters like Flukeman or any of the various alien forms that appeared in the show is the right approach for Sideshow but I'd like to see some of the other supporting characters immortalized as figures.
Krycek and Skinner sold out and currently go for insane prices so the demand is definitely still there. With the Gunmen the best way to go would be to release them all as a three-pack because I think the majority of people would want all 3 but there would be people that would pick and choose and I can see people only buying Langley or passing on Byers (who is my favorite of the three but could be considered boring visually) or buying Frohike for the smaller body he'd likely have, etc. and forcing people to buy all 3 would solve that problem.