My guess is they will never stop going after the basement grower. After big business starts growing it by the ton, There not going to want you cutting into there market. Theyll take away any rights to grow your own.
As far as price, my guess would be at retail a 1/8 might go down to $15-20 for top shelf. If it was legal nation wide. It not only has to be produced, But it has to packaged, stored, shipped, have mark up for retail and then taxed. The thing is most pot heads are picky about there weed and will pay the little extra for the newest, freshest, best thing the coner store has hanging on the rack. And 1/8 will last alot guys a weekend. Theyll look right past the $5 1/8 mass produced greenhouse kush.