Originally Posted by GeoffC
I suspect there are far too many Kindles in the wild for Amazon to suddenly shift tack and offer ePub format....
It's no different really to "suddenly" offering KF8. They'd need to update their firmware and arrange it so only Kindles with the epub-capable firmware would get delivered epubs and others get mobis. Over time they could get most people on epubs and start only having new books in epub format.
Of course there's no reason for them to want to do that - they lose part of their lock-in - but it's certainly doable.