I loved the multiplayer in Metroid Prime: Hunters and wouldn't mind seeing it again, to be perfectly honest. At the same time, it'll have to compete in a rather difficult climate today. At the same time, it's not really what many seem to expect from Metroid judging by this thread, which is understandable.
Still, I felt Hunters did a rather confident job in expanding the Metroid universe. I'm still very curious learning about the other hunters and their planets. At least it seems Sylux might appear again in the future, judging from interviews. I honestly wonder if Federation Force will manage to do the same, as from what's available so far it doesn't seem to share the same atmosphere as the other games.