I again ask the question: Why though?
Those were all long running series with a lot of history behind them.
Mortal Kombat had two movies, one of which was a decent martial arts movie at best, and the other of which was terrible even by video game movie standards.
Absolutely nothing would be gained by keeping the continuity of the old movies. All it would do is make the original MK characters - the ones people actually care about - hard to use because they're all 20 years older now, not to mention also dead in a lot of cases, and probably won't even have the original actors come back.
It would be a better idea to distance the new movie from Annihilation so people don't say, "Hey, a new Mortal Kombat movie is coming out! I should go watch the first two movies first!" and then get turned off by how awful Annihilation is, like how Batman Beyond distanced itself from Forever and & Robin.