This is a part of the Windows as a service track they are on. It's supposed to keep everyone on the same version of windows at all times to ensure maximum compatibility etc. In fact only users of the enterprise version of Windows 10 are able to choose whch updates to install or not install.
I get why some people are concerned but really we already use devices that make use of this policy on updates so I don't think this will be a big deal. VBesides the updates are tested by users before they are released as mandatory updates. Yes, there might be an update here and there that might be an issue but it'll get sorted out and fixed. I for one am upgrading day one on all my PCs because it works great and let's be honest a real step from 8/8.1 and while in some cases even 7 especially if you have a touch device. This is a non issue for a majority of W10 users as most will likely be running pro and you can delay updates "for a time." Also I'd like to point out, you don't have to pay $99 for the pro version if you are already running pro or ultimate versions of 7/8/8.1.
But hey, if you are uncomfortable, wait. Just don't wait until after July 29th, 2016 ;)
