Yeah, I understad that.
But most countries are underdeveloped, or in ways of development, and there it's not really viable now.
Also, take into account this. The scalability IS a fundamental issue because the quantity, quality and speed of production needed to feed the global population are not compatible with the limited space, resources and the physics, chemistry and biology of soils. You will cause massive soil losses due to the mere fact that such soils will be above their limits.
There's also enviromental and echological issues, such as the point that you'll be displacing many native species (both from plants and animals) to be able to grow others that are edible to us, massively altering ecosystems. If with the scale of plant production that we now have that's a serious problem, imagine with such a drastic increase. We wouldn't give enough.
Moreover, think on the issues of transport: not all plants are able to grow in every country, and as such you'll have to move a massive amount of these around the globe, boosting the carbon footprints of global transport.
And then we have all the hydric issues, and all the issues with fertilizers and insecticides.
And it could go on, but it would never end.
I have to look better at these studies, tho, I'll do it later because nevertheless it looks like there are interesting advances I haven't heard of before, and that makes me a bit excited because anything that can help both humanity and animals is good.