Universal Studios is owned by General Electric. As a member of the general public, you have absolutely no say in what GE does in regards to releasing content in high definition. As an owner of GE stock, you have a voice, and are free to contact them daily to express your disapproval with Universal's decision to support only HD DVD.
Well, here is your chance to be heard.
One Share allows you to buy a single stock of GE, making you an investor in the company. This service is for gifting, so you have to select Paper Frame, Plain Matte, and No Engraving to get down just to the stock, but once you do, it comes up to $79.
So, now that you've spent $80, you have a right to contact these people:
GE Investor Contacts
Call them daily, weekly, whatever. Just call and let them know how you, as an owner of GE feel about it.
So, how serious are you?