The Firefox graph [1] also looks strikingly similar after introducing Silent Updates since Apr. The trend of 'Move Fast And Break Things' seems to be coming from the web applications world into the world of installed applications.

Users seem to be more adaptable to change that previously thought. This is of course thanks to better testing tools which ensures that essential functionality is not compromised by such changes.

With the introduction of OS-level App stores, expect to see 'silent updates' in a lot more consumer applications.

[1]: http://clicky.com/marketshare/global/web-browsers/firefox/