The Technical Strategy email was sent out about midway through our adoption of Scala. I didn't explain the dynamics of our larger development department much in my post, but at that time we were essentially two teams in two different physical locations. The location I was at had already seen success with a few projects in Scala (BeetleJuice and the beginning of our API). Our CTO thought it was time to set a clear direction for the future of development department after an analysis of our current situation and discussion with members of the wider team.
Nobody was shown with the door. I'll admit there was some resentment, but nothing a well adjusted developer couldn't get over.
As I mentioned at the end of the post, one thing I would do differently in the future is make a stronger effort around consensus building about the decision. However, the Scala change started off as something small and organically grew into a legitimate alternative to the Microsoft stack. Going into our first project (BeetleJuice) we didn't anticipate the impact it would ultimately have on the organization.