I suppose that the Star Wars Galaxy would hit a technological plateau where there wouldn't be that much of a change for thousands of years.

Technology has been rapidly advancing for us since the Industrial Revolution but before that it stayed pretty much the same for a very long time.

If we reached a point where all things that were practicle for us to use were discovered (or discovered to be impossible to build) we might settle back until our circumstances changed when we found new problems to solve.