Some people probably think that FireWire is still relevant.
FireWire is still highly relevant. It may become less so in the future, if/when TB devices become available for everything from inexpensive high speed (including backup) disks to digital audio. Some people think that USB 2.0 is still relevant, but, it never was. TB could actually replace FW, something that USB never could, not even 3.0.
Do informed posters think it's just a matter of time before Apple fixes this issue with not being able to use a 27" iMac as a display for a PC sporting DisplayPort, or do you think this was done deliberately by Apple in some bizarre misguided attempt to force users to switch? (Or maybe it was unintended, but Apple simply won't invest the resources necessary to fix it; I imagine there are a fair number of people with current 27" iMacs doing exactly what I want to do who will rule out upgrades unless this situation changes).