BTW, in a few months' time - do you really think Red will sell a 2/3rds "consumer" Scarlet - and tell everyone to buy a $4000 card to watch it in realtime in full quality?
If they do, they will get hammered in the reviews because reviewers and consumers won't have a rocket. They will try to play it on their desktop and will say "we can only view it at half res debayer, and it's grainy"
In order to avoid this, I am certain RED will make sure their code is multithreaded soon.
To me RED Rocket is a cool thing for people who want to monitor at 4K. For normal finishing, HDTV resolutions, it should not be necessary.
So yes, I do not see a need for RED Rocket if you have more than 6 months' patience.