I think the apex of this, in the long term, is simply whether or not the general public will be happy with the performance and cost of 1.4G fireworks.
The general public's opinion on the performance of 1.4 will have no influence whatsoever over any legislative changes restricting the availability of 1.3.
The vast majority of fireworks are bought by 'once a year customers' who don't remember what previous performance was like. Rockets not withstanding, most users will probably not even notice there's been a change. Any decline in sales will result from a minority of enthusiasts not wanting 1.4 products, and annual buyers not liking the significant price increases this year.