Re: People seem to forget
@DanBowmanLeBeau...
You're dead wrong: every time a company has to spend money replacing hardware, the company pays a cost. It's not "we all" having do anything, because (and follow closely here) not every buyer of hardware is a government, and even when they are, there's no good reason why taxpayers in (say) Podunk, Indiana should care about the failure of staff halfway across the globe TO MANAGE OBSOLESCENCE.
Stuff does become obsolete. Competent folk manage it. E.g. by buying spares as they go EOL (either as new stock, or by buying other people's used systems at pennies on the pound), OR they decide that the actuarial tables favor crossing their fingers and hoping for the best.
As to your example, finding a replacement motherboard with an ISA slot (or a parallel port, or whatever) is NOT AT ALL DIFFICULT. As another commentator showed, a few seconds with Google will find you plenty solutions (typically in Industrial Computer space). Fancy two ISA, four PCI, two PCIe, serial (five, including RS-422) parallel, bunches of SATA, gigabit Ethernet? Commell (www.commell.com.tw) makes a P4BWA mobo that will keep you happy!
All this whinging about Apple hardware ignores the bigger issue: software! Had you a PPC or (gasp) 68K system, your only hope would have been to eBay something! Yet I don't hear people yelling because a copy-protection scheme on a piece of software that they (and I) had would only work on a true compatible IBM PC running at no more than 4.77MHz on a 8088... (that was why we had "Turbo" buttons on compatibles, remember).
Things change; deal with it... as in, manage, handle, process, accommodate, you know, DEAL with it!