I sometimes think 7.1 and these new audio codecs were invented to make us all buy new amps to go with our new Blu Ray players. ;)
I don't even have wall space to put more speakers in my main setup. I'm not sure any of my local theaters have 7.1 outside of the IMAX screen either, but I digress...
How were credit scrolls done in the 70's? It was all printed on a big plastic roll that was cranked in front of a camera, right? At least that is how it was done for tv at the time. Character generators were around, but often looked a lot like PONG.