Thanks to the Netherlands, our Euro brethren developed a head start on the open market, however, I'd argue that the U.S. medical program closed that gap long ago, but in a closed market instead. Now that legalization exists for recreational purposes in the U.S., I'd imagine the gap will close in the open market as well.
Growing MJ was never legal here. Selling seeds, and 5gram per day per person is. We for decades have grown in small closets, attics and humid basements, always hiding from the cops, risking a raid every moment. Many small growers, and also small breeders, some of the popular ones have surprisingly small rooms. Space is a major limitation here, something that's usually not the case in the US.
So yeah, I definitely expect the US to close a gap (if it even exists, consider this a more serious reply
) over a short period of time.
That won't be done by many of the self-proclaimed pollenchuckers in the US though, but by a couple of professionals. Modern breeding = applied genetics.
Many of the breeding practices I see are acceptable in the US are totally unacceptable here.
Finding a male and chucking its pollen on all popular clones does not make a breeder. It's not like with horses and cows where it's all about the male's sperm. I know first hand from several breeders in the US that is how they operate. New ones pop up frequently.
Intersex traits are not acceptable (GHS is far more popular here than in the local forums).
Breeding with feminized seeds is not acceptable.
Crossing two F1s from someone else and call it breeding is not acceptable.
In many ways that's taken way too far, as if breeding is something people should leave to uhm... breeders who have been doing it for a decade already. Point is, we certainly seem to be more demanding over here which may have a positive effect simply for giving posers less chance.