It depends hugely on where they end up landing on home growing. Right now they're considering 4 plants per residence for personal use. If people can grow their own the retail proposition is very different.
Speaking from experience in Colorado where we have a 6 plant limit, it is plenty. The commercial markets focus on good producing strains, rather than connoisseur strains that often taste much better. The problem has been seeds, but my understanding is that BC has some very good seed banks. I hope you all have the opportunity to cultivate your own plants, and 4 seems too few if you want to keep the pipeline full (i.e. clones/veg/flower).