My point is this, short of banning eating meat people will continue to do so; even if you made vegetables 1/100 of the cost of meat and fixed the calories / Lysine / Methionine issue (which would probably mean post processing the vegetables which increases costs). Banning means legislation, that means politics.
So seguing into climate change issues, this took politics too. It started with grassroots taking hold in the 60's counter culture, then the start of political pressure in the 70's. The first big political move was Reagan coming on board during the 80's; and also some lucky technology hook ups like solar powered calculators (never underestimate the power of logistical growth from a low end but widely used product).
The 90's brought us government sponsored research and industry backed development and product roll outs; this led to massive improvements in cost mainly though scale. The last 15 years have led to product refinements, financing options, and a greater society wide understanding of just how bad climate change could be.
And now we are at a situation of solar becoming cheaper than coal for producing electricity. 50 years!
So if you want to achieve the same with meat vs vegetables there is an enormous amount to achieve, above all you'll need to convince people at least as well as climate change issues, get government backing, make it as enjoyable as eating meat, and drive down the cost of Lysine and Methionine extraction.
In fact Canola (low erucic acid rapeseed) meal (what's left over after oil extraction) is currently used as livestock feed, this could be used for human consumption but would require further post-processing and possibly protein profile adjustment.