The remaining time on BRV will get your kids into adulthood, and you into your 60s. The additional points will make it easier to afford 1BR villas, giving you more room and making it easier to book non-home resorts at 7 months . The 11 month advantage is more needed at BRV than AKV (in general)
If you enjoy both resorts equally, IMO everything favors BRV outside of the expiration date. Personally in your shoes I would want the extra points, but only you can decide how heavily the expiration weighs against the other considerations for your family.
The other consideration is direct vs. resale. They both have their pros and cons, but IMO unless you place high value on being able to book Riviera and other possible future resorts regularly with these points, I can't see paying for direct. Again personally I'd rather have the extra points/