You can only lose your virginity once. And you can only have that special connection with a person for the first time once. And after you break up, no matter how much you'll look to recreate that exact feeling with someone else, it won't happen, even if that person is smarter, prettier, funnier, etc...
For many here, MK9 was our first serious fighting game that we tried to get really good at. And, even if that isn't the case, it was probably the first that really made us super passionate, in large part because it was the MK game we've been craving forever. The nostalgia factor helped, as we knew all the characters, and the game was admittedly very good. Since then, I feel the majority of TYM has just been looking for ways to recreate that feeling they had when they played MK9 for the first time, and subsequently spent years trying to level up at the game, learn match-ups, grind, etc...
I don't think this can happen again. Objectively, MKX is a better, more polished game. You might prefer MK9's mechanics, and that's fine (I probably do as well), but you'd have to be seriously willfully ignorant of a loooooooooot of issues to claim it was a better game overall. So this is just like meeting a hot chick/dude who everyone on the outside can see is a lot better than your ex, but you're hung up on the fact that "it's not the same." MK9 is like that relationship you had in which you were madly in love with someone who on the whole, is a pretty cool person, but you had tons of fights, drove each other mad, but you always found yourselves drawn back to each other because you "get" each other.
A lot of people here were disappointed in Injustice and hoping MKX would basically be MK9 2.0, and when that didn't happen, they found themselves kinda disappointed. But honestly, most of the reasoning seems to be revolved around "I don't know man, I like MKX but I'm not fully digging it. It's not the same" which basically means its issue is that it's not MK9. Now there are a lot of legitimate issues you can have with the game, but try to objectively list both games' issues side by side on a piece of paper and see if you don't run out of space far quicker on the MK9 side.
Anyway, what I'm trying to say is, move on, and appreciate that new person in your life for who they are, instead of always falling back to comparing them to your ex. They're a lot more stable, prettier, funnier, smarter, they dress better...but they can't use the internet (which was acceptable with your ex but you'd expect people to be more technologically advanced as time passes).
The above words of wisdom were brought to you by Coolwhip.