I would only upgrade if there are features on the new one that you think you will actually put to use enough to justify the expense.
I have been considering getting a machine with features that mine doesn't have. So far I'm not convinced that it would be a wise move at this point in time. The main reason I'm not getting one is that while I would love having all the latest and greatest, I also know most of that "stuff" would never be used more than once or twice if at all. So for now I'm going to spend that $ on more fabric. Lol!