Two answers:
1) Yes. Very, very easily. For at least some IKEA furniture. 2) I somehow doubt that second hand furniture was from the 'IKEA of that day'.
I think that's the parent poster's point. Presumably his parents are not significantly wealthier in relative terms than he was, but they could afford more premium furniture than most people today do.
I'm typing this on a computer that was given to me by a company that didn't need it any more. I could afford to buy a new one. But since the one I have is more than enough for my needs, I don't need a new computer, so I don't buy one.
I definitely don't think that tells the whole story, but do think it could play a part in it.
You can still do that today, and get a wardrobe for 8K, that lasts 40years. But now we do have "cheaper alternatives". His point exactly.
That's ridiculous - of course there were. Sears & Roebuck were selling furniture out of their catalog well over 100 years ago, and that was far from the only option.