TNA gets a consistent 1 rating on cable. If what they pay for a 1 rating is better than what they would pay for a .3 rating with a Charles in Charge/Joanie Loves Chachi block, then they keep TNA. If not, you'd have 2 of the greatest themes in television history on Spike.
No real surprise, given their general level in the company, but I'm still bummed. I, for one, actually liked the Heart-throbs, and I though they really could have been a big part of a solid tag team division.