Yeah, I'm totally sold on any of these ideas either.
I actually had a thought of a future gimmick similar to a couple of your ideas. (Not sure if I ever posted it on this site) But to sum it up, it was that there are a group of skylanders with no element and you could use special magic items to give them an element that would change their design and how their powers work, in small but significant ways.
But I doubt any of these ideas will happen. There just isn't much to create a story around it.