There was a recent front office shake-up at Viacom with their Bellator MMA product, with the reasoning being they wanted to take it to the "next level." Bellator doesn't even do TNA ratings. They also foster a GLORY kickboxing product, that doesn't even pull half of TNA's ratings.
With that knowledge, I feel like Viacom isn't leaving the wrasslin' business, but maybe want to take it to the "next level" as well. What that means, who knows. Maybe they buy into TNA or GFW to take some control of that path to success. Hell, maybe they buy WWE in an attempt to take it to that next level.
That's my pure speculation, anyway.