I thought your argument was that the recombinant strains of mj would be useless for getting a THC high from smoking, thus rendering the smoking of mj useless. If so, then a low THC strain should accomplish the same thing.
As far as total displacement is concerned, presumably as the plants interbreed among themselves, the recombinant genes will be passed on.
So why haven't ditch weed or low-THC hemp plants done the same? And what is to stop growers from selecting out seeds from recombinant plants, or breeding out such a trait?
The deal is that whenever the plant is heated to 180 degrees, the cellulose turns to alcohol.
That would make smoking unknown weed quite hazardous (hence the reference to a Richard Pryor moment).