While most buyers do pay promptly because they want their purchase as soon as possible, being forced to do so may not go over all that well.
Until the testing, sellers were asking for IPR to remain on BO, but there is unlikely to be any demand from buyers.
On Fixed Price items with BO, we don't see many complaints about BO payments being delayed and usually those payments are as fast as FP/IPR or only a few hours later if the customer is not at their computer when the BO is accepted.
The problem with Unpaids remains overwhelmingly with Auctions, where winning bidders are thrill bidding, forgetting that they had bid a few days ago, or have purchased elsewhere while the auction slowly moves to its end.
I see this as a solution without a problem.
