Hey Rendegade,
That's really the direction I'd like to see the 'BPA' go in. Probably require a name change. I'd like to see a rolling 10 year limit (anything up to 10 years prior) which would allow new airplanes every year. I think it is safe to say that anything over 10 years old is probably not too competitive in the top 2 (maybe 3) pattern classes. The OS 140RX is 12 or 13 years old and that's a long time in pattern years.
-WIll