First, thank you for your thoughtful reply.
Yes, the future makes "intellectual property owner kings".
I would posit that we don't want kings of any kind, political, physical, intellectual or otherwise.
Actually, it's not the "future". Before the rise of the PC and internet the richest people I ever met/heard of still were developers of IP (most had developed patents).
E.g., I've seen or heard of people like the guy (or actually his decedents) that patented the galvanization process or created a fabric 'loop' in use by the textile industry. Mega wealthy.
But these are patents, not copyrights.
Patents are less of an issue however. They are currently fairly limited. Probably still too long, but they're better than copyright.
I'm not sure why that's bad, or why a (time) limited monopoly of an idea you developed is bad. (See comment below.)
It's not necessarily bad, but copyright law has to be looked at as a whole. Changing the game with laws like DMCA and ACTA and SOPA might be reasonable when looked at by themselves, but when paired to eternal copyright it looks different.
It's hard to comment on your question(s) because copyright/patent law is complicated and there are variables I suspect you may not have imagined.
Quite the opposite, I've been involved in copyright discussions for most of my professional career, initially because I was right in the middle of it, and now it has simply become kind of a passion of mine. It started when the tiny company I was working for (I was their first employee, and created one of the very first CD based legal research sytem) had to fight West Publishing because West claimed a copyright on federal caselaw based on the "creativity" of arranging the caselaw in their Federal Reporter volumes. Yep, they claimed copyright on page numbers. They claimed that scanning their books amounted to copyright violation, and that if people wanted to publish those old cases they'd have to get them directly from the court system. Yeah, good luck getting prints of decisions from 1880. At one point, to be in compliance, before scanning we were putting stickers over every page number so it never made it into RAM as an image. So trust me, I'm no stranger to the bizarre edges of copyright.
E.g., you pose your question as though the "3D" printer/machine that can create these tangible items (homes etc) is owned by the person. I can tell you that if the inventor of that 3D machine were my client it would never be sold outright. Never (at least not while the patent/copyright was in force.)
Instead, you would lease it from our company. Your lease fee would depend upon what you used it to make. You make a hammer, you owe a small fee. You make a house or a jet aircraft, be prepared to pay big bucks.
I.e., the 'business model' needs to be taken into account.
And it doesn't strike you as odd that an invention of such magnitude should not only make the inventor money, or even lots of money, but obscene amounts of money. On top of obscene amounts of money. For many, many years. Or outright locked up so that nobody can use it.
I can also imagine a long chain of people taking their cut. Most 'customers' of the 3D machine would be utterly incapable of programming it create anything complex. Therefore the people who set-up the programs for a house, a car, a plane or basically anything with moving parts would probably charge the inventor of the 3D machine a royalty too.
Most 'customers' wouldn't need to program anything. They could rent the machine, buy some of the consumables, go up to 3DPrintTorrents.com and make anything their hearts desired.
(For the "see below" comment.) I have no problem with patents being 20 yrs. That may actually be a bit short. However, I checked out the period for copyrights and it is well over a 100 yrs, I think too long in most all cases.
Fern
And as I said, I have less of a problem with patents (though they have their own serious problems, see: Software Patents). But would printable 3D templates be patented or copyrighted? If it's not an invention, it wouldn't be patented. Maybe it's just a hula hoop, long past any possible patent. But somebody had to create the file, and that means copyright. And just like I can't write a book about Larry Kotter the child magician without being sued out of existence, will the "owner" of the first hula hoop template shut down any and all future hula hoop templates as derivative works? Or shut down any website that tells you how to make your own hula hoop template?