I suppose the problems arise when infrastructure has to be built for those linear communities (Dutch word of the day:'lintdorp', or ribbon-village). Because suddenly the average population density is awful and we have to drive a lot, build more schools and hospitals, etc. Not to mention the poor sods that have a 500 km commute to work the land so that the rest of us can eat >:-)
https://www.designboom.com/architecture/saudi-arabia-the-lin...
I'm not convinced it's not vapourstructure given how ridiculous it seems.
That's some tell-tale bullshit right here.
That said, the video is very interesting. As well as branding - The Line. Would work very well as a setting in a sci-fi movie or a videogame.
There is ~4ft of shoreline in the US per household, which gives me some notion of what the packing would look like.
That assumes everyone wants shore view. With young kids I prefer my house to be far away from places weak/non swimmers can drawn. I know many other reasons why someone would choose to not live somewhere far from the sea if they get a choice.
That rules out whole countries. And misses all the fun of having water nearby. The chances of that happening are so vanishingly small that it probably is a bad guide as to where you want your kids to grow up.
So the buildings would double as a tsunami wall? Interesting, though kind of self-defeating.