I think that buyer feedback (except for did-not pay) is almost irrelevant.
And sellers that did not leave positive feedback upon payment brought this on to themselves.
In reality, all it means is that sellers won’t be able to chase the 100.0% feedback, because there will be a noise level of problem buyers. 95% is good enough, and no one will care.
Maybe eBay values its buyers more because the buyer’s eyeballs are the key to success. Sellers must go there. I can buy an iPod or a memory card on any auction site, but the only place I can sell something and get the best price is eBay. Honestly, it is the buyers who made eBay. And I have bought and sold plenty.
I’m glad the feedback older than a year will not be counted. I’ll be back to 100% after a couple of retaliatory or unstable buyers and sellers.
You sellers will be just fine. You’ll all be equally affected, and no buyer cares about 100% feedback or selects auctions based on that.
In the real world, even the best retailer have disgruntled customers. Why worry?