OK. People who don't understand network distribution shouldn't talk about network distribution.
1) Spike TV is marketed as a male-oriented network for viewers 18-34 years old. The only reason they get female numbers the way they do is because they are also known as "The CSI Channel", because if you want to watch CSI at any given time, the odds are about 50/50 that Spike is airing it.
2) Television programs do not choose what network they air on. They create a product and then attempt to sell it to networks. Networks, if they are interested, buy that product (the television program), and then sell advertising during that program.
3) CW just had the product of the larger professional wrestling company fail to achieve the ratings they were looking for, so they'd have to be huffing glue to make a deal for TNA's product- or TNA staffers would need to be huffing enough glue to sell at a price that would make the show appealing to broadcast television.
4) The options for TNA/IW to move off of Spike is limited. They aren't going to any NBC stations, as the WWE has their deal with them. With Fox's new deal with the UFC, this is definitely the wrong time for them to introduce professional wrestling, right as they are trying to get MMA accepted as a mainstream sport. ABC/Disney have never shown any interest in professional wrestling; it simply doesn't fit their company profile. That leaves Viacom, which owns Spike.
5) Spike TV isn't holding TNA/IW back. That is an excuse offered up by the people operating TNA/IW, because they'd like to keep their jobs. You don't simply get to say, "I want to be on this channel, and I want this kind of advertising for my shows, and I want this kind of distribution, and, and, and...." You need to demonstrate to people that would spend money on you that the money is being well spent and will return as a profitable investment. TNA/IW's finances have been opaque for years, and they haven't been reporting any good news that would attract investment.
(To the "but Panda Energy has all the money they could need" crowd: A single major investor is a horrible idea for a business, because the second that investor decides to pull out, your company fails. It's bad for the single investor as well- many business owners have toppled their entire enterprises by backing one losing horse for a little bit too long. Every business comes back to "at the end of the day, is it making money?", which is why we aren't talking about what's going to be on Nitro tonight. I don't know that Panda Energy is the majority interest in TNA/IW currently; but I do know that they were not too long ago, and there's been no reason for anyone to rush to buy stakes in TNA/IW.)
I'd love to see TNA/IW at 9 o'clock on CBS, but it ain't gonna happen. TNA/IW gets what they can gets.