With the exception of the number of people being hunted, and the survivor being granted safe passage home, that's essentially the plot to Predators. Therefore your plot synopsis gets a "no" vote from me. It'll just be more of the same, which was one of the biggest complaints that most people have about Predators in the first place. So you change the planet they're on, triple the number of people being hunted, and double the number of predators hunting them. So what? Its all been done before.
That's pretty much the trouble with movie sequels in general. Whatever was done in the sequel is pretty much just a rehash of what was done in the original. Stray too far from the original concept (like Jason Goes To Hell for instance) and people hate it. Stick too closely to the original (like the first few Friday The 13th sequels) and people get bored with it. You have to be able to give them what they loved about the original, but present it in a new way. The Scream franchise is a good example of this concept in action. So is the Nightmare On Elm Street franchise, though to a lesser extent.
That's why I keep suggesting Predator prequels. They've been hunting humans for centuries. Surely some of those hunts were less successful than others (ie: the predator becomes the prey) which would make for good story material, from the human point of view. Then there's also the "Rogue Predator" angle, where a predator comes to Earth without permission and starts killing anyone and everyone, caring only about the quantity of trophies and not the quality. Thus a second predator is sent to stop him. The rogue is the predator society's version of a poacher (which to them is the worst possible crime, save perhaps murder), and the other is the predator society's version of a game warden or park ranger. Its his job to make sure that all hunts are authorized and that the hunters follow their "Hunters' Code". One could even set a movie about a rogue predator coming to Earth in the past, thus making it a prequel and also having the whole "Predator vs Predator" angle.