How about self hosted without complexity?
Many companies are hesitant to rely on cloud services for file sync and sharing, but the alternative doesn't have to be something as complex as OwnCloud. Companies like Accellion have a packaged on-premise file sharing solution that offers a similar intuitive end-user experience to Dropbox. In addition as a private company driven by customer requirements it also comes with open API's and integrations to things like SharePoint, Windows File Shares, DLP, Outlook and so on.
So yes, deploy using self-hosted private cloud, (80% choose on-prem over cloud) but when working with critical documents and content, like the author suggest, think carefully which supplier to bet the ranch on.
Gartner produced an interesting report of the major file sync & share players for the enterprise which you can download for free here http://tinyurl.com/l9o6gh7