You have to admire It's Damn Real - the poor guy always praying that TNA will amount to something more than a televised indy show, hahaha.
In all seriousness though, CM Punk would definitely be a marquee signing for TNA, probably their biggest signing ever, and would probably bring more viewers to TNA than Hogan did, as Punk is still in his best years...
... but you're an idiot if you think it's actually going to happen.
This is a man that obviously considers himself "the best in the world" - so much so that he left the WWE because he wasn't getting the treatment he felt he deserved. Why would he think joining TNA would solidify that title? The "Best in the World" wrestling anywhere apart from the WWE? That would make no sense. Before you all get your panties in a twist, I'm not a WWE mark, and I couldn't care less if he returns to the WWE, but let's be honest - if you're a guy that wants to be recognized as the best wrestler in the world, why would you want to be anywhere but the biggest wrestling stage on the planet? (Biggest wrestling stage =/= best wrestling company, I want to clarify). And even if TNA revolved their entire company around him - featured him in every segment, from backstage promos, in-ring segments, commentary, divas matches, their online media, handed him every title they have (on top of creating a "CM Punk Division Championship" for him), give him Hall of Fame status within 6 months - deep down, we know that won't be enough for Punk. Not with the WWE always overshadowing TNA. TNA isn't WCW.
On TOP of all that, Punk has been pretty vocal about how he feels about TNA in the past, for example:
[youtube]6zOr51gqDbQ[/youtube]
Now, another wrestler, you may think "yeah, well people have swallowed their words in the past and jumped ship" - and that applies to anything; we've seen professional footballers join teams they swore never to do so in order to either advance their careers, or, as in most cases, make tons of money. That last sentence hammers my point home - going to TNA won't advance Punk's career, and he knows that. And money? I'm sure with his private bus and first class airfare, he wasn't doing too poorly with the WWE and isn't scrounging for cash with the other ventures he's gone into recently (i.e. Nerdist).
In my roundabout way of saying it, the reason why Punk won't join TNA is simple: he has far too much pride. That's not an intentional dig at TNA, it's the honest truth. This is a company he's made fun of in the past, he's made enough money to retire and live comfortably (along with providing a comfortable living to his loved ones), and he considers himself to be a premier, first draft, first pick, wrestler. He's not Hogan, he's not Flair - if he's out, he's out on his own terms, and if he comes back, he'll come back on his own terms, and not because a second tier wrestling company is desperately offering wads of loose change. If we see CM Punk in any other wrestling company other than the WWE, I'd only expect to see him in ROH due to his ties there (I don't think he'll consider his brief fling with TNA, the highlight of which was a pre-show brawl with another wrestler, much of a connection).
CM Punk in TNA will have to remain in either fanboys' dreams, or in a created in-game storyline - which will ironically be done so on WWE 2K15.