Theoretically, true. I'm just not entirely savvy as to how that would truly affect Juggernaut. He isn't defying every law of nature but he does defy many of them. From a basic standpoint taking no factors into account, then by all means you are correct. However, these are denizens of the Marvel universe. We could just as easily have a warp tunnel appear in the sky, raining Spidermen from the Future, or we could have Loki mind control Hulk again during all this. I'm talking big team battle. Also worthy of note to say that I'm sure his strength is so massive it would be hard to stop him with anything short of stepping out of his way as you stand in front of a teleporter to some distant desert.