No the game is just fine the way it is. I Have no problems with kabal.
The REAL problem is people not sticking with their characters and finding out everything possible in any MU.
I come from the smash bros community and the same thing happened with BRAWL.
Metaknight destroyed everyone and it ended up where everyone had a pocket metaknight to fight metaknight.
People stopped playing their main because they found they could win all matches with their pocket metaknight better then they could with their actual main.
Im not saying this is happening here, because let's face it there are not hordes of kabals like there were metaknights.
But people are picking up the better 5-8 characters of the game in tourney setting. This does hinder the meta game of the cast.
Now, there was a point when TO's started to have Metaknight banned tournies.
I will say that this did allow for a lot of other characters to evolve since no one had to worry about metaknight.
I don't think MK9 needs this, people just need to stick with their characters.