IE9 to IE10 was aggressively launched as well. I believe users got a basic prompt and IE turned on auto-updating by default. According to some of my users, IE10 just appeared, so my guess is that MS may have the prompt time-out to 'yes' instead of infinitely holding the computer.
Here in corporitstan, I had to put in extra blocks to keep 10 and 11 away, due to our CRM being suck on IE9 for the time being. Trust me, MS is trying real hard to get everyone to the newest version of IE.
So that experience alone tells me that not everything is done right yet. And even if everything would work, they have to keep doing things right for some time to regain trust.
[1] http://windows.microsoft.com/en-gb/internet-explorer/ie-11-w...
Windows 8.1 is a free upgrade on Windows 8.0, more like a service pack release (when you look at the changes). Why not port it to Windows 8.0, it didn't make sense, 8.0 should fade out as people install the free upgrade that comes via Windows Updates (or the store, I forget which) and is a mandatory update. Opting out of mandatory updates means you opt out of associated upgrades.
This isn't a new or unique policy in Windows, look at iOS, you won't get WebGL on Mobile Safari without iOS 8, OSX doesn't back-port Safari and Andriod has a lot of versions with terrible browsers.
Win8 ships with IE10. If it did an upgrade, then you should be on 11 now.
Also, most of the WebGL demos around the net do not work in Firefox for me - it is possible that it is something to do with the installed drivers. However, they work perfectly work for me in IE.
They have auto update for more than a couple of years now.
http://www.geek.com/news/microsoft-decides-to-automatically-...
IE11 has been released on October 2013 (8 months ago), but IE10 market share is still 6.77% today (compare with IE11 at 17.03%). I'm quoting NetMarketShare (but it doesn't really matter, all browser stats agree on this topic, with slightly different numbers).
For comparison, Chrome and Firefox versions usually go under 1% after no more than 4 months after a newer version has been released.