You think if Silver gets his own Generations, Mephiles will have another chance?
He could be.
I meant if Sonic/Tails/Knuckles/Amy got Eggman, Shadow got Black Doom, who's Silver main archenemy?
Nega Eggman probably (though he's more like Blaze's), but still not enough.
Mephiles could fill the role if the story's being done right.