You are completely ignoring the most important question. Can methanol be produced without consuming more energy than it creates, particularly with regard to fossil fuels, once all inputs are accounted for? I've seen no credible evidence that this is possible with any existing or near term likely technology. I'd be happy to be wrong but so far I see methanol fuel production as merely a less stupid version of ethanol fuel production. Same fundamental issues exist. It still is a carbon based fuel with the pollution issues that implies, it still is a net energy loss and it still results in larger net pollution once all inputs are accounted for. If it helps here and there with specific problem then great, but I'm not exactly going to get excited about it.
No, they don't. Not if you do it right.
Cute how you think there is this vast amount of "wasted" land that we can raise crops on without any work or energy consumption at all with no detrimental environmental effects. Look, I think methanol is underutilized too but I see no evidence that it is anywhere near as easy or efficient to use as you make it out to be at scale. Furthermore while it is cleaner than coal or oil on its own, it still pollutes in much the same way as fossil fuels. At best it mitigates the problem but it doesn't make it go away.
Half of all human-edible food produced today is wasted
Which is a problem but one that alcohol fuel production isn't going to solve or improve.
Second, it has NOTHING to do with soil quality.
If you read what I wrote I said that soil quality was a minor factor. (Though I disagree that soil quality is completely unimportant)
Yeah, except for all those ethanol plants which could easily be converted to methanol production.
Great. Even if we converted them all today (which isn't easy or cheap), now you are up to 14 billion gallons and the electricity needed to run the biorefineries mostly comes from fossil fuels, especially coal. Furthermore starch derived ethanol is a very different process than cellulose derived ethanol. Plants can be converted but it's not nearly as trivial as you make it sound. Obviously we CAN create production capacity but I see little evidence so far that we should.