cpanel on a cloud, can it be done and auto scaling?
if so, who has this?
3Tera have implemented a scalable cPanel solution which works on their AppLogic product. Essentially their process enables you to build out cPanel in a much more scalable way, with load balancing, data redundancy, and a number of key services separated onto dedicated virtualised instances so everything isn't running on one installation. The AppLogic grid has full hardware failover. So yes it's possible, but it's not a cheap solution.
Auto-scaling? No, but an 'easy-to-scale' environment that can take cPanel beyond the capabilities of a single server without code modification.