Definitely a design wall!
Not only is it functional, but a great source of inspiration .... and a way to showcase your work too!
While you have been using the pool table to lay out your blocks, you'll discover the design wall is much nicer. Plus, you "see" your layouts much better. And to say the least, the floor space it saves.
However, the pool/ping-pong table would be a great place to sandwich your quilts. So if you are going to get rid of them ... consider where/how you will sandwich in the future?