Spear Pillar's loop is even simpler to run than Temple's, and the stage was awful in a lot of other ways beyond that. I love stages that do stuff or have complex geography more than almost anyone else, but Spear Pillar was finely crafted to be totally unplayable. I can't say I'm going to miss that stage, and I sure hope that none of the new stages are like that.
Of course, I say this like it's a hard rule that two Palkia can't be on the field at once, but we know that's not true. It's easy to make happen in a Pokemon link battle, and if Sakurai wants it to happen in this game, it will.