Sometimes it gets worse, sometimes it gets better. It depends on a lot of things, like stress levels, husbandry, handling, etc. While no one can predict whether your snake's wobble will get worse or better, I will say that the worst cases of wobble I've seen were in snakes that suffered from inadequate care. The wobble may not be predictable, but you can reduce the chances of it getting bad just by taking good care of your snake.
For my spider, he didn't show any wobble at all when he first hatched out. He started wobbling a bit as he learned how to move, and then it went down when he got the hang of it. His wobble is pretty minimal now that he's close to adult size.