I say get rid of all this legacy stuff - it's about time!
Floppy drives
serial ports
parallel ports
ps2 ports
If the mobo and PC manus would put USB 2.0 and IEEE1394 (Firewire/iLink) on all motherboards and provide plenty of them (8x USB + 2x 1394 on the back and 2 each on the front) it would lower the manufacturing costs for PCs and all of the peripherals. Yeah you may have some legacy devices that you still use, but an adapter isn't all that expensive if you're replacing an entire PC or motherboard/proc, etc.
Using floppies for emergency recovery is passé. I've been doing this with CD's and CD-RW's for over a year. The basic drivers just have to be installed - i.e. Win98 boot CD. A ubiquitous CD-RW write format included in the boot process would do wonders. Microsoft (and appropriate others) just need to add a "format/make boot CD" option just like with floppies.
The moment these ports start disappearing, the industry will stop making stuff for them. Most keyboards and mice are now USB with a PS2 adapter included in the box. Most new printers have USB ports. Any new serial device that isn't USB doesn't deserve a place in the market. High bandwidth devices should either be USB 2 or 1394 (or both would be better) - web/digital cams, scanners, external drives, etc.
If you don't believe that the industry can adapt that fast, I dare you to find a brand new ISA, EISA, MCA or VESALB card at your local PC shop or large on-line reseller. The second motherboards stopped carrying the slots, the peripherals disappeared. Yes, you may be able to scrounge one up somewhere (an auction site or in your old PC), but the Fry's Electronics (arguably one of if not the largest electronics stores in the US - think costco with just electronics gear) near my house doesn't even stock them. I recently asked an employee (16 yr old compu geek) if they had any ISA modems and he actually thought I was talking about DSL or Cable or something. He seemed pretty knowledgable about drives, mobos & memory, but it blew me away. How many of you teenagers out there have even seen an 8 track or Beta VCR?
It is time to get rid of the stuff that has no purpose.
I thought a thought, but the thought I thought wasn't the thought I thought I had thought.