This is going to sound crazy, but hear me out. Generally, the biggest beef people seem to have about Blacklist is that it's not Splinter Cell. The mechanics have changed so much it's no longer the same game... The characters have changed so much they are no longer the same people... The voices have changed... Etc etc... So, there are lots of very unhappy fans out there right now. But here's the thing: no one would be so critical about Blacklist if it wasn't part of the Splinter Cell franchise.
So... Ubisoft could, in theory, decide right now to make Blacklist a new, separate franchise. All they would have to do is change Sam & Grim's faces, change the look of the goggles and revise the script to remove any mention of 4E, Sarah etc. The sad thing is, these are the only elements of Splinter Cell that are still present from what I've seen - and they are have no real affect on the actual game.
If you think about it, it would work. They story is generic enough and a one-man-army super-soldier is very commonplace. In the end, all you have is a superhero tracking down bad guys. Yes, this superhero wears goggles that look like Sam's, but they don't work the same way or serve the same purpose. Sam's real goggles allowed him to see when the enemies couldn't and navigate through areas that would otherwise be impassible. Sonar goggles just let you see people though walls so you can mark bad guys and kill them instantly. The silly thing is, seeing through walls and super-human speed are superpowers.
If Blacklist wasn't Splinter Cell, it seems like you'd have a game that resembles a cross between Tomb Raider, Uncharted and stereotypical shoot-em-ups. People like those just fine, so it would probably do okay. And of course, if Blacklist was removed from the Splinter Cell universe, it would no longer be necessary to destroy the Splinter Cell legacy and devastate its most loyal fans. Splinter Cell would sell in today's market. There are plenty of games out there that are very complex and they still sell. Besides, Ubisoft makes tons of games that hardly sell. Not everything needs to be a triple A title.
So, that's my idea with a bit of rambling thrown in on the side. Again, it would work. You could remove all indicators of Splinter Cell and you would still have a good game. That's very significant because if Blacklist was really a Splinter Cell game, you'd have nothing left afterwards.
EDIT 1: In response to the people who say this would never happen, you're right. I don't think it's a viable idea - I think it's an interesting idea in theory. It's an observation. It's true that this game could easily exist outside the Splinter Cell franchise. And that says a lot.
EDIT 2: Since there's been so much negative feedback lately, it seems like this might actually be a good idea, if not a realistic one. Thoughts?