it seems inevitable that fake meat will reach a texture and taste level that's "good enough" for fast food titans to offer alongside the normal, bargain (dollar menu ish) type stuff. if you add in the economic arguments - fake meat being way cheaper logistically i'm guessing and only going to get cheaper, perhaps order of magnitude levels so - then i would wager that the lower-end options will be the fake meat stuff (which those of "lesser means" might switch to consuming) whereas the "real meat" becomes the more affluent option.