I would love to have simon belmont in smash bros, ive wanted him in there for a while because hes one of my favorite characters from one of my favorite series. But why must he be brought up in the same breath as snake so often? Im sure if nintendo asked konami would oblige, but then its hard to imagine them just forgoing one character in place of another from the same company when said previous character is bigger and already has most of the leg work done. Simon would be great, but konami knows where its bread and butter is, and it shows in their releases as of late. They are not interchangeable in the same way mega man isnt an easy swap out for Ryu, it more then likely would not go down like that. Of course ideally id like to have both, and sonic (sorry to his fans) can take a hike since he has brought the least amount to smash bros as a whole other then his icon status.
Snake is a great character because his series like mario had come from the same era, and his games have managed to stay as awesome and relevant today as they ever were. Due in part to their creators making sure they are in good hands, but also each series has evolved while still being what we knew them as to begin with. Konami has pretty much thrown castlevania out on its ass, with igarashi gone, and mercery steam moving onto other things, will they even give it the attention it deserves? Snake may not have the marketable mascot look many seem to associate with game characters, but his impact cannot be denied and that difference is what makes him a great contrast with the rest of this games cast. Simon while great, doesnt quite have that, sure hes legendary, but so are many other castlevania characters like alucard. Im just curious if they would make their own design for him if he was in smash bros, his design has never been consistent. What im trying to say is, while simon would be fantastic (even for the music alone), he should not be thrown around like he and snake are competing for spots, because the one that made it, made it for a reason. The only way i could see simon getting priority would be sakurai, since he seems to guide and base most of his character decisions on his past history or nostalgic parts of series, thus why little mac has more arcade influence then NES influence.
