it'd be awesome if Blu-ray players could also play HD-DVDs....
It would be awesome. Then I could play my HD-DVD copy of the The Hitcher. Actually, there is still an HD-DVD player in my house, and luckily, hddvds are cheap as shit on amazon and ebay. You could probably find an hddvd xbox 360 add-on for super cheap somewhere too.
I used to have an XBox 360 HD DVD player but it broke, leaving me with 60 HD DVDs and no player. Luckily, I found a Toshiba HD DVD player on Woot.com for only $50 bucks. You can find 'em on ebay for crazy cheap nowadays. Better buy one now before they became an antique and cost hundreds of bucks!
I believe that's why there was that whole format war at the beginning between the two players. And HD-DVD lost.