There are a lot more enemies to be fought with Space Marines. I would love to see more chapters to play and maybe even some other races.
Also, the WH40k universe has so much dept that I believe the possibilities are endless.
Fyi, I never played or liked the table top game game itself, but the story behind it really fascinated me.
Yes, the Imperium of Warhammer 40,000 should be made into more video games, because the concept of the final frontier in space and the concept of war in space is an interesting issue and people will buy it. It also comes close to some real questions in life, as we explore space and what other life might exist.
Warhammer 40,000 is the perfect futuristic utopian/dystopian environment for video games. Developers can basically have whatever format and technology they want with such an open palette of a fictional setting so far into the future. The possibilities are endless! Thanks to awesome graphics and advanced playability of the newest consoles and fantastic computing power on laptops and PCs, Warhammer 40,000 should definitely have more video games in the future!
Whether or not this idea should be put into other video games depends how popular this idea is with the game players. If it is very popular, and the people who play these games want it, then yes it should be placed into a lot more video games, so that more will be sold.
Just as there were days when the pen and paper role playing game was in fashion, so too was there once a time when tabletop war games were all the rage. Times have changed. Tabletop RPG's and war games have given way to video game RPG's and RTS games. Computers and gaming consoles are better able to handle the multiple calculations involved in these games quickly and accurately leaving the player to sit back and enjoy the game instead of stuck behind a calculator working the math. The Warhammer franchise is a relic with no place in the modern pantheon of gaming.
The first game it was made into was not very financially successful and sequels will probably not fare any better than the original. There is more than enough of Warhammer 40,000 to pull from story wise, and there is better original content out there than just rehashing the stuff from Imperium.