We own at Beach Club and my parents own at boardwalk. There would be a few issues switching.
1. It is harder to book this late at BCV since it is smaller. I know we book at our 11 month window just to be safe every time we plan to go.
2. BW is only 10 points a night for a standard view room and BCV is 15 for a standard view. The seller probably doesn't not have the extra points at the moment and does not want to go through the hassle of switching. But at this point the rooms are not available anyway.
3. The pool situation is annoying but you can go to the villa pools at BW instead of going over to BC. But I would take atvantage of Stromalong Bay at BC since no one is usually allowed to pool hop there.
...honestly I would look into buying your own next time you go and buy at the resort you want. So that you can make changes yourself. Of course you can only do this if you can afford it but its atleast worth a visit. My wife and I bought at Beach Club in 2011 and slowly add on more points as we can afford to buy more.
Good luck either way your at Disney so smile