Blue is, of course, subscribing to one particular theory of time travel. He's going to be in real trouble if it turns out that the blue Kirby and Mr. Saturn just visited another dimension that just happened to be x amount of time in the future, or if they just visited one possibility of what the future could hold.
Boy, it's not like time travel is needlessly convoluted or anything. I bet this particular plotline will only get simpler and easier to follow from here!