PCIe, PCI and AGP

[ewx]

Not so long ago I discovered that (1) I had no ISA-capable motherboards any more (2) I had a large pile of ISA cards of various kinds (3) nobody else wanted ISA cards, even for free.

Currently I have computers with, variously, PCI, AGP and PCIe slots and a number of PCI and AGP cards, some in service and others not. What I'm wondering, in the light of experience, is when PCI and AGP cards will reach the same kind of useful-to-nobody stage that ISA has already entered; it might be better to get my spares into useful service somewhere or other than to keep them in a box for a decade and then bin them.

Any guesses?

(The same applies to PATA, actually.)