That would definitely do it to a certain extent, but the vast majority of people right now aren't interested in super-HD. HD media is catching on slowly enough because most people don't seem to care about the difference between HD-DVD and DVD.
It couldn't stop piracy, it would just end up differentiating based on whether or not people thought 1.4 gig .avi's are good enough.
If I were the MPAA, I would push partnerships between player makers and TV makers. Make it trivial to play super HD content. They should add their own P2P download rental service to schedule movies -- another convenience factor added on. If a TV just worked with super HD, and if it were internet enabled to get the content I want, piracy would significantly decrease. Piggyback on top of FIOS, and you'd have something great.
I was thinking about movies and realized that one way to stop pirates is to leapfrog a generation of HD quality. If movies were 3600x2400, even with h264 they would take eons to download. Also, they would take a great deal of time to recompress [compression is much more cpu intensive than decompression]. This makes the amateur pirate's life harder. There would be a reason to buy/rent the disk. Avoiding piracy through innovation ... what a thought.