Ultimately, I would expect these craft to be as safe and need no more maintenance than current commercial jetliners. Not to mention an ability to carry more passengers. If you could carry 300 passengers instead of 30, your costs go up somewhat, but the cost per passenger goes down.

It WILL happen. Maybe not in the next few years, probably not even in the next couple of decades, but it will happen (hopefully with the lifetimes of some of the younger of us on here).