First of all, let me just say that I don't really mind who ends up running CoX if it ever gets picked up again. I just don't get why we want it to be run by a huge megacorp like Disney who might not understand this game's audience as much as another might.
Meanwhile, Valve's one of few non-evil gaming companies, plus one of the only mainstream developers I can think of that still publishes their own games as well. Plus they have experience running free-to-play games, with both TF2 and DoTA 2 being F2P with a cash shop. Plus they were one of the companies making an offer months ago. They made an offer that got turned down, yes, but since then it's been revealed that NC wouldn't be selling until after the 1st, if at all. So why shouldn't they try again once it's back on the table?
That said, I can see, partly -why- you'd want to pitch it to Disney. Superheroes are at the most popular they've been for years and it's primarily because of the Marvel Films movies. Disney's rolling in that MCU money and just diving into it like they're Scrooge McDuck, so why wouldn't they want to get another piece of that superpowered pie, right? They already have a game they're promoting as an MMO, and another in development, so they're not going to want competition for their new baby, even if they're getting the money for all of them.
And, going back to my point about Valve, I feel like they're more likely to try and piece together the remnants of Paragon than Disney is to try and get their in-house teams to learn how to code the game.
That said, I realize it's probably too late to try and change course, what with all the big name fans supporting the Disney effort, I just wanted to share my 2 inf.