Not that it will ever be practicle, or do-able, or feasable, or anything, but I like people who think big like this.
I have always said that, unlike our Luddite Leftists, I believe that Technology will save us from whatever environmental ills befall us. But in order for this to be so, we must keep PUSHING our economies and technologies FORWARD, not backward, like the tree-huggers want to do.
I like idea people also. One idea spawns another and another.... Eventually something workable is hatched. Here is another twist to capturing the jet stream. Run these things up over mountain peaks and high ridge lines. There is a enough wind flowing along ridge lines to crash airplanes and winter jet streams pass low over many mountains. I believe the highest recorded wind was at Mount Washington(?) in New England.