It may seem that Nintendo is certainly trying to make MOM approachable in at least the Japanese market. By using tradition anime-esque art style and hiring the hand of a well known Japanese developer to help make the game, i think its reasonable for one to assume that Nintendo is trying to make Metroid a sellable franchise in Japan.
But what about the rest of the world? MP3 certainly eased the difficulty and added optional hints (more so than past Prime games), and with MOM focus on story and cinematics, the game could be sold to the mainstream western market.
P.S. By mainstream i dont mean "casual". Well what i am thinking about is the mainstream GAMER, not the mainstream audience. Mario, Halo, GTA will be remembered by those that arent even gamers. Those franchises are beyond gamers, and are part of the popular culture now. Games like Gears, God of War, Assassins Creed, and, to a lesser extent, Zelda are all popular GAMER games, franchises well known to your average gamer, but not so to your average person.
The Metroid series has never sold to the mainstream gamer, and im wondering if the newfound focus on cinematics and story will make it more appealing to that market.