The MMA fighters are gone. Sting has been de-emphasized enough to not really be worth complaining about. Him being there isn't THAT much of a problem since he's still a big name and great talker you can do stuff with, it was him being in main events at 55 years old that was ridiculous. (I'd try him out on commentary myself)
As for Hogan, in kayfabe it makes no sense since Dixie should want him gone because she's a bitch + Hogan was completely useless as a GM, but fuck it. He's gone. Lets just smile and enjoy that. Enjoy that Ditsy finally came to her senses and realized he wasn't worth the money. Enjoy that we don't have to deal with announced title matches that don't happen any more. Enjoy that we don't hear about "the Aces of Eights" any more. Enjoy that we don't get any more never ending promos that lead to nothing. Enjoy that no more main event segments will be wasted on useless BS just because Hogan's in them.
Maybe now that he's gone some spotlight can go to the people who TNA should be spotlighting. Not holding my breath though.