Nah... We've had Workspace for a long time and there are still users that adamantly refuse to use Google Apps over MS. They actually have good reasons as well. Since Google just has web apps only there's always extra steps uploading all the office docs they get from other businesses.
We tried blowing Office 2013 away on everyone's machines after being told most users didn't think they needed it. Now, a few months later 90% of our users have asked for a 365 license.
What typically happens from what I can tell is that most businesses just end up having a mix of both 365 and Workspace.
Enterprises are moving to Workspace from 365. I hope they drive each other's prices to the bottom. :)