Contact Autodesk AND your retailer DIRECTLY. Chances are the people who matter never look here and don't care unless they hear from a lot of people.
Let them know how much you hate their decision. Tell them that you will NEVER buy Autodesk again and that you will go WAY out of your way to dissuade anyone else from purchasing AD (in a legal fashion of course).
Let them know that by doing this they've created a slew of enemies that are determined to really damage their bottom line and ruin future sales at every chance on ANY of their products. For example, where I work now, I'll be in the position to change over 100 seats of Inventor to a competitor during our next evaluation. Say goodbye to that AD! Let them know this decision IS going to cost them (in the only area they care about). Let them know that if they think you're going to buy Max or Maya, think again.
In short, do your part to reduce their sales and let them know that you will continue indefinitely.
Just my point of view on what might work. If not it will still be fun and slightly satisfying. Other ideas most welcome