First of all, Microsoft has no qualms about telling visitors to their help websites to go to hell if they try to use any other browser than IE. No reason not to return the compliment, is there?

Next, do you really expect a lot of your early adopters and contributing users to be IE6-bound?

The only way IE6 is going away is if it stops working. The iron law of reality. If you're not ready to formally announce that your thing won't work with IE6 then announce that it won't work with it yet, and then keep kicking that can on down the road. Forever.