Here is what needs to happen with Metroid. They need to present the story like it was presented in the Prime games. Minimal story, but through exploration, you can really flesh out the world. Story doesn't need to be a focus. The lore of the world however needs to be interesting. Make it so the lore reads itself to you so you don't have to scroll through walls of text to get the interesting info.
Then, revert the series back to it's roots. Exploration, has and always will be the defining aspect of great Metroid games. Prime, Super, and Prime 2 all had exploration. Other M, and fusion didn't (connection?).
I say, really try new stuff, a "reboot" isn't needed. I would argue that Prime is essentially the franchises reboot that build the foundation on which the rest of Metroid games should be built. It doesn't have to be first person (I'd prefer it) but it should focus on exploration.
Put out a 2D Super Metroid esque game on 3DS, and Prime-esque game on Wii U, and the franchise will be set for rebirth.







