I have moved some of our wooden stakebeds but they had only been in for a few months. We moved one that had been in for a year and almost couldn't move it. After setting for a while, I think sediment settles in around it and it kinda grows to the bottom. After we did move it, it fell apart and dissappeared. We found parts of it that have floated up on the bank. We used a big treble hook that we had made out of rebar. You can try moving your beds but your success depends on the construction of the bed. I'd move it if I was you because if you ain't catchin' fish, your just waistin' material and if it does get ripped to shreds you haven't lost anything because it wasn't doing any good.