Having had the opportunity to work on a new build using Magento 2 the architecture of the application has changed significantly, to me it has definitely increased the difficulty of getting a Magento project up and running but in return offers a more granular and organised application to work with.
With this view I think it’s unlikely that you would upgrade your site to v2. Magento have not given an upgrade path to 2.0 and I doubt they will, so it’s probably worth waiting for the opportunity to re-design the site before moving over to the new platform.
Magento have committed to 3 years from general release of 2.0 so that gives you till around 2019 to move over. In the meantime that means they will continue to provide security patches and support for the 1.x platform.