I disagree- some "dumbing down" is good thing. I don't miss the older games that had crazy input motions for special moves that were prevalent in the 90s and early 00s, for example. Not that this was ever a problem in Mortal Kombat.
Now, if you're talking about more intricate features in regards to game play, then yeah- agreed, because joe average player doesn't know or care what that shit is and it won't affect his enjoyment of the game beyond going online and getting pissed after someone with an ounce of skill stomps all over him. Most of the people who buy this game will probably go through the story stuff, do some light online, play with their buddies...and that's it. I'm sure this game will sell truckloads of copies no matter how big the FGC crowd is for it.