You can lobby your fleet captain in your District forum, but some postings elsewhere are relevant to all. I'll start with
this :
Dacron weighs about the same as a standard composite sail except for Cuben fiber which will be prohibited via the bag weight rule.
Based on the complaints cropping up here, apparently not.
The proposed rule does not prohibit Cuben Fiber, carbon, or anything else sailmakers may dream up including North's 3Di. These materials are lighter, stretch less, and usually more expensive.
It also does not prohibit excessive reinforcement, heavy footlines, boltropes, or fittings intended to increase the weight of the sail. Depending on local PHRF restrictions, one could use an underweight mainsail for handicap, and then fill a Velcro pocket near the tack with corrector weight in order to meet the proposed class 'bag weight'.
I presume the bag weight is intended to control costs by discouraging class members from purchasing expensive lightweight sails that may provide a marginal increase in performance. That is consistent with my view that the proposal itself is still not cost effective for one-design.