Seriously think about this for a second:
Situation A) Big Pharma is just leaving "billions" on the table. They sit around their tables and plan how to keep people sick and just crossing their fingers no one ever hears about the magical wonder drug "da budz", because you know, they don't really like making billions of dollars and are just leaving it to chance no one figures out how awesome Mary Jane is.
Situation B) There is no fucking way on God's Green Earth Big Pharma is leaving that much money on the table based purely on the hope and prayer it stays "illegal" (protip: whole bunch of shit they make is illegal, hense the prescription). In fact they are well aware, more so than High Times, the uses and benefits of hemp and THC, and have more than one contingency plan in place so they won't lose a single cent.
Also, I'm going to LOL when Monsanto is selling all the pinko hippies on my facebook page the packs of joints they buy in the store 10 years from now. Philip Morris Brand Weed, "Can I get a pack of Marb Greens please?"