Do you think that PlayStore for android phones should accept Bitcoin as a payment or AppStore for Iphone? Steam has no problem with Bitcoins, so why shouldn't PlayStore and AppStore use it? It can use BitPay like Steam and most sites that sell something online.
It would be great, but do you think it will happen?
No, google has huge and very serious business, every modules and etc that they have on their websites, is almost made by them, they are using their payment system and it's more safe to pay with bank and bank's card than bitcoin. Simply they don't want and need bitcoin, they are trying to promote their payment system.
I don't know what to say about appstore, I also don't think that itunes will accept this.