The problem is that you're assuming I'm in SV, I'm in a small Swedish city and I'm seeing our _very_ windows heavy company starting to adopt Apple computers.
And when I think of the companies I worked for in London they were also increasing the Apple quotient of desktop/laptop machines.
Yes, this is anecdatum but I really can't tell you how strongly integrated Windows is at my company and we're still seeing adoption of Apple computers.
Regardless of that, Sysadmins and Developers tend to get to choose their OS at most sensible companies. (Every company I've worked for, barring the current, has allowed Linux; most even encouraged it)
And when I think of the companies I worked for in London they were also increasing the Apple quotient of desktop/laptop machines.
Yes, this is anecdatum but I really can't tell you how strongly integrated Windows is at my company and we're still seeing adoption of Apple computers.
Regardless of that, Sysadmins and Developers tend to get to choose their OS at most sensible companies. (Every company I've worked for, barring the current, has allowed Linux; most even encouraged it)