So when will this be operative in ebay? I have seen nothing there yet, no merchant is accepting BTC and I see no option to set btc acceptance oficially.
Acceptance will completely rely on sellers deciding they want to take btc. They wont be forced unlike credit card or bank transfers through paypal.
But I can't think of any disadvantage for the sellers to accept bitcoin. Since Paypal is partnered with Bitpay and Coinbase, the bitcoin payment will be converted to USD immediately so the bitcoin price fluctuation should have no effects on the sellers.