Literally all they had to do was remaster the original METAL GEAR games for the 3DS and/or Vita and they'd be swimming in money and praise.
And a Ghost Babel remake would probably make them more money than they could spend.
Focusing on the actual game in question:
The concept is interesting, and it could easily spawn an enjoyable multiplayer experience. If done right, it could be the next "flavor of the month" for several gaming communities. Arguably, we really haven't seen a decent co-op stealth game since the days of Splinter Cell: Chaos Theory, and off the top of my head I can't think of one that allowed for a full team of 4 players.
That being said, using the Metal Gear name as a crutch reveals they have little to no faith in the game and those developing it, and is more likely to make fans of the series upset than it is to draw in new players. In fact, as the Metal Gear franchise has so much backstory and
L O R E, I could easily see this choice making potential new players hesitant to pick up this game without experiencing the previous titles, by which point the game (and possibly Konami) may no longer be relevant. At least if they hitched onto another existing IP, they could free themselves from being known as "The People Who Make Metal Gear Solid and
Sometimes Pachinko".
Ultimately, I'm conflicted. I'm interested in the concept and I want to see similar ideas in the future, but success would only tell Konami that they don't need to move on. Plus, if they're willing to stand on the back of recent controversy and spit in the face of a loyal fanbase only to make a quick buck, I have no problem watching their efforts crash and burn.