Or it's unacceptable that I can't buy hay to feed my horses every mile down 5th Ave in Manhattan. Sorry -- you're entitled to your opinion, of course, but it's a pretty silly thing to say. The world changes. Things progress.
I also find it hard to blame Apple for the death of 68k and PPC. If you know what the dominant processor architectures will be in 2035, please tell me which stocks to buy :)
Powerbooks and iBooks, on the other hand, are paperweights today. Machines made in 2005 should be usable today (and indeed, the '05 Windows machines are still usable today).
[1] with Dosbox or virtualization, but that's not the point. Any similar measure is not available to run your m68k, ppc/classic or ppc/osx applications.
If "things [really] progress", they should not leave entire groups of people behind. On the contrary, progress is also about lowering the wall that prevents people to get in to the latest and greatest, no matter what their background is. Not raise it.