Given there has only been one "real" movie in recent years ("A Million Ways to..."), and entertainment films with trains are few and far between these days, it is more likely that the first filming with a rebuilt #168 would be a commercial or yet another insipid cable TV documentary that rehashes Old West history that's been covered better elsewhere. There needs to be a moratorium on documentaries about Jesse James, Wyatt Earp, Billy the Kid, and Butch Cassidy (among others). If you've seen one, you've seen them all.
I do agree, an F&CC alumni doubleheader (both 1890s), Eureka/Glenbrook pairing (both 1870s), or dual T-12 class excursion (both 1880s) would be a hoot and definitely gives us reason to live to a ripe old age! Four of those six locos are movies stars, too! And Glenbrook has a sister who did quite well in Hollywood.