Jeff-
The broadcast TV standards will not change to all-4K signals for decades, if ever, and if/when it happens, there will be converter boxes for existing TV sets just like we have now for NTSC sets.
So, the quick answer to your question is "the picture will look just like what you see today, because the signal from the new box will be the same as you have now."
The comment/idea that "sets under 30 inches will not display 4K pictures properly" is really just explaining that there is no point in making such small screens have resolutions that high, since you will have to have the TV set within a couple of feet of your face to see a worthwhile improvement over 720p/1080p. (Although, there are ridiculous overkill cell phones on the market now that may already have 4K displays on them.)
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Chris
Quote from another forum: "(Antique TV collecting) always seemed to me to be a fringe hobby that only weirdos did."
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