WRT to the cable railings - they are still allowed via the ICC and most local building codes for new construction and remodels (I'd say ALL local building codes, but I am sure there is one somewhere that disallows them). There is some talk of changes in the ICC that horizontal railngs, cable, stringers, whatever may be banned because of the potential climbing hazard. We already have the "4 inch baby head" rule, which is that stair railings can't be more than 4" apart to reduce the hazard of children getting their heads stuck. Trust me, I have had a baby (albeit a couple of decades ago) - their heads are bigger than that at birth. I could see why someone with small children might not want horizontal railings/cables, but I'd hate to see them not allowed by code.
I am always amused when some of the reno shows run into code problems - I think it was LIOLI where they wanted to do a single change to the stairs and because of some other code issues, they couldn't make the single change without bringing the entire staircase up to code, which wasn't possible without completely ripping the staircase out and changing the structure of the second floor. The contractor was guessing $8,000-$12,000 for the change.
One of the things Chip is really terrible about (although they did talk about it on one show and then seem to have forgotten it) is that instead of just smashing things, they could be removed and reused elsewhere. The unsupported brick walls could have been taken down (believe me, with that much flex, they'd have come down easily) and then put back up selectively to give the house a little more curb appeal. I don;t think that (relatively) it would have added huge cost.