"Mr Donahoe said Ebay was not expanding the PayPal wallet to include Bitcoins, “but we are watching it”." Donahoe is Ebay's CEO.
... it will inevitably come to pass. It would be ridiculously easy for them to simply add xbt as yet another currency and they'd have the benefit of their exorbitant inter-currency exchange fees, 2.9% transaction fees, as well as adding a layer of chargeback-ability through their dispute resolution process.
The only question is what's taking them so long? They've been hinting at this for months now, possibly to gauge public reaction? No doubt that coinbase, bitpay, etc are on their radar too.
The implications will be significant. The user base is huge, but the benefit of lower merchant fees will be gone.