Probably not unless you really wanna catch em all. Soul silver is just a remake for people that were not around when the original came out so thats kinda worth getting i guess . There won't be anymore remakes (at least i don't think so) and i dont see many more genertations coming out soon so black/white might be the last.
They will probably make more mini-game games that are usless instead of rpgs. Wish they would make something liek pokemon stadium again :s.