That dang date-based ticket pricing hasn’t been around long enough to impact me yet, but I think Disney tends to be pretty flexible with a good sob story or compelling reason for changes/refunds/exceptions. If you’re firm on your family’s travel week (yay!) I wouldn’t be too reluctant to buy tickets as, worst case scenario, you could probably get the cost you paid for tickets applied to other dates if your plans change. Though, since they just raised prices, I think you’re in the clear to wait if you want to shop around or let the WBC booking go through and wait til the next paycheck or credit card cycle. Not that I’ve ever done that...