It's almost certain, that there'll be CE 1.10.x, CE 1.11.x and so on. Magento 2 has no clear upgrade path from Magento 1 and because of that vast majority of existing stores will postpone full overhaul as much as possible. I'm also pretty sure that even after Magento 2 launch there'll be plenty of new stores that still use Magento 1.

As far as I know eBay has commited to support Magento 1 for at least three years after launching Magento 2 and I've heard promises that some of the Magento 2 updates will be back-ported to Magento 1.

TL;DR: There's no reason to abandon enormous and profitable market called Magento 1 and move over to relatively minuscule Magento 2 market. It's going to take years before Magento 2 becomes viable market and there's no way that vendors would stop churning out stuff for Magento 1 platform meanwhile.

It's almost certain, that there'll be CE 1.10.x, CE 1.11.x and so on. Magento 2 has no clear upgrade path from Magento 1 and because of that vast majority of existing stores will postpone full overhaul as much as possible. I'm also pretty sure that even after Magento 2 launch there'll be plenty of new stores that still use Magento 1.

As far as I know eBay has committed to support Magento 1 for at least three years after launching Magento 2 and I've heard promises that some of the Magento 2 updates will be back-ported to Magento 1.

TL;DR: There's no reason to abandon enormous and profitable market called Magento 1 and move over to relatively minuscule Magento 2 market. It's going to take years before Magento 2 becomes viable market and there's no way that vendors would stop churning out stuff for Magento 1 platform meanwhile.