I'm a Ruby developer and interested in creating a business in this space. Specifically a online-CMS that generates static html uploaded to a CDN. The target market is businesses who need to know their content is "uncrashable" and "infinitely scalable". The price point would be >$100/mo. Get in touch with me if you are interested in that idea.
The technical side is not particularly difficult aside from dealing syncing and maybe failover. What is trickier is probably the CMS side because building a CMS is like the definition of feature creep. Eventually people want/get every feature under the sun, even if that doesn't really scale.
You probably have an interesting business there, but managing customer expectations and finding the happy balance in terms of investment is tricky.
Also, the customer acquisition side of the business is somewhat tough, but worth solving.
Good luck!