What do you wish was made into a game? I got two that I think about all the time.
1. Stargate Dungeon Crawl: You are an SG team, and every board can be a completely different vibe. Go through the gate with a mission. Maybe you are dealing with advanced enemies, maybe peaceful primitive societies, or a Gouald base. I would play the heck out of it.
2. The Warriors Area Control Game: How is this not already a thing? It could be totally asymmetric with all the ridiculously themed gangs and all.