After Luke's Uncle John stabilized the new reality, Luke's box of X-Form condoms suddenly disappeared and Luke and his girlfriends forgot that they even existed. Luke himself knew that the new reality was indeed "new", but he couldn't quite remember why, only that it had something to do with his Uncle John. It was a side-effect of the reality stabilization.
But just because Christmas was over and the X-Form condoms were gone, it didn't mean that the story was over. Not by a long-shot.