I would submit that the gay-rights thing was about as polarizing as corporate greed because of the religious spin. Gay rights was still unstoppable, however.
Similarly, I think if they have more mothers out there showing epileptic babies being treated with oil, that's public pressure you can't stop.
The pressure is mounting and while you'll have some corporate influence / associated industries to stop this, the reality is that shit tons of money and industry has been hedging their positions in anticipation of the new multi billion $ weed products market.
I think it likely at this time that any corporate influence would not be the prevention of rescheduling/ legalization, but rather the delay of it so as to control the situation for future positioning and profits. Like the Canadian bridge asshat