In my opinion I really like the concept however I see 1 problem that bugs me:
"What happens when a buyer does not collect an item?
If a buyer doesn't collect the item after 7 days, we'll return the item to you and you'll need to issue the buyer a refund."
That's an easy way out for buyers if they change their mind after payment. This will affect private sellers.
Along with that it angers me that eBay are making it seem like this is something entirely new and that we should be grateful for.