A Borg movie should be a full-on alien invasion movie. They're in right now. And so are zombie movies.
It's too bad Abrams isn't likely to direct the next one. I know he tends to be derivative of his hero Spielberg, but Abrams's more robust style lends itself well to this type of film. I think he would have made a better War of the Worlds.
For it to work, they'd pretty much have to turn the Borg up to eleven. Make the cubes truly massive, for example.
I can't help but picture the trailer:
A ground shot looking up (or perhaps across New York harbor) and seeing the silhouettes of these massive cubes poking through the distant sky.
With a bombastic modular panning effect (like a louder version of Spock's meld from ST09), as if it were bouncing off the Earth, we hear:
"We are the Borg. We will add your biological and technological distinctiveness to our own. Your culture will adapt to service us.
Resistance is futile."
It's haunting and chilling and makes the Borg awesome again.
It's certainly a bit cheap, and probably a little trite, but it's guaranteed to put butts in seats.
People can scoff and say it's the wrong reason to do something, but it is why Hollywood exists in the first place. That's one thing the "something original" crowd doesn't quite get. Those types of films aren't guaranteed to be successful. the modern market is so much different than the one 25 years ago. A TVH isn't likely to be as big of a success as it was.
I think this might be a fantastic blockbuster, and with the budget to show the Borg as horrifying as we know they are.. yeah it could end up sci fi horror.
And it would be interesting if they developed a virus to wipe them out and Kirk had to make the same choice Picard did and he chose differently.