They recently increased the MB amounts back to $10 pp at WLV and $13 pp at HH and VB. The main risk as things sell out is that a specific use year may not be available. That's not as bad for a new owner as one who is adding to their DVC holdings.
I think you can safely expect to see the current MB hold through the end of the year as long as a resort doesn't essentially "sell out". Even when a resort is sold out, there will frequently be straggling and small points packages. You may want to make contact with a guide, if you haven't already. That way if things get critical, you'll have someone helping you through the mine field.