I'm pretty sure we can all agree that if you play this game, you love. Knights of the Old Republic or even just the Old Republic game, both are amazing and their stories are solid.
We all love Star Wars and we all want a movie based in the time frame of the Jedi/Sith war and what better way then to base it off a video game. Yes it might be risky, but if it has Star Wars in the title, it will make money no matter how crappy it is and that's why Disney/Lucasfilm need to take the risk and make the movie.
The big one, we can see the story of Darth Revan and Darth Malak on screen. If this were to pan out and be successful, we might be able to see Darth Bane introduced in later movies.
If we go back to the Jedi/Sith war, the movies would be completely different than the 6 original movies(which I so happen to like each and everyone of them). What I mean by that is, the Jedi and Sith were always fighting and there weren't a lot of politics involved. We might be able to get military strategies, old techniques, the old leaders, everything that happened and made the Old Republic interesting.
New costume designs could expand and grow. look at this.
Old Republic Jedi
Old Republic Sith
Old Republic Mandalorian
Old Republic Trooper
Many differences, I personally like the Old Republic look a lot more but that's just me. But what do you think? Would you like to see this as a movie? Comment below.