"Big pharma is recognising medicinal marijuana's potential, with the global medicinal cannabis market estimated to reach nearly $24 billion". I think there are many countries where it is already touching it.

Big pharma sells weed in pharmacies, here in germany, right now.

Big pharma already sells synthetic cannabinoids and direct delta-9 THC analogues and have for a couple decades, almost.

They almost certainly would. There's plenty of scummy ways to do business, my guess is they'd produce blister packs of gel capsules filled with THC oil at 480% markup and then fight tooth and nail to recriminalise all other methods of intake.