Well, I'm thinking the sales on a big hardback X-Com book might not be commercially viable (unfortunately, as I loved the games, and still play Apoc from time to time), but a 96-page X-Com (or similarly-themed) sourcebook might be far easier to get into production, with a hardback generic Sci-Fi hardback rulebook (seeing as its probably the biggest omission in the OGL range at the moment) aimed at a wider audience.
As far as usability goes, I'm torn between the usefulness of an entire game in a single volume, and the affordability/storage advantages of a single copy of the rules with smaller settings sourcebooks.
Hardbacks are Mongooses thing they haven't released a Setting Rulebook that hasn't been hardback.. its one of the reasons I love the company so much,, perfect bounds just dont ring my bell.
Also Mongoose are one of the most proactive Companies to date and have a number of licenses under thier belts though to date only wizards have tackled a computer game license for use as an RPG (Warlands) and X-Com along with the likes of Fallout are some of the most loved computer game series ever released!
However as I say I wouldn't be opposed to a blatant "this is based on but not called" Alien Invasion type OGL book
Cpl. Mark "Neo" Howe
MI Forward Reconnaissance, The Wolf Pack
Mongooses "Old Man" of Playtesting
completed playtests #130!
Gaming since 1980