But, sellers can still receive negative feedback, just not buyers! This really satisfied my primary whining point that once a customer pays, they have fulfilled their part of the contract and should get feedback on that aspect. If the seller chooses to not leave feedback, that is OK since feedback is always voluntary.

I am sure that the mechanisms (besides feedback) will still be in place to deal with bidders that don't pay.

I think this relieves the buyer from the need to provide positive feedback out of fear of reprisal. The worst that can happen with the new policy is that they don't get feedback from the seller at all.

I think it will actually lead to more neutrals and negatives...

I do have some minimal concern from a selling standpoint, but since I don't send items until Paypal funds are received (I usually only accept Paypal) I am happy. I may end up getting a negative at some point, but even then I can't see that I would change my mind. As long as I get my money, and know that I will bend over backwards to keep a seller happy, I will know that any negatives are undeserved.