I think it's a tough sell to get M2 to existing M1 clients.
My proposal would to rebrand M1 to MLite. That's basically what it is, a Lite version of M2 these days, which needs less resources to run than a M2 installation.
Otherwise I suspect there will be a large bubble pop and that will be it.
As footnote to this, since I can't edit the original post.
Even though these stats aren't going to be wholely accurate, but as a view point in through the window and the fact we're coming to the end of 2017.
14,116 active sites using Magento 2
220,143 active sites using Magento
A friendly reminder about the real EOL for M1: https://magento.com/blog/magento-news/ongoing-magento-1-support
(my 2 cents)