It's understandable why developers might be upset if coding for a new operating system meant renouncing their current platforms for tools considered less capable. But the assertion from Ars Technica that developers are "horrified" seems like a broad generalization at this point, as understandable as that kind of reaction might be given Microsoft's lack of clarity on the subject.
Even the Ars Technica post ultimately acknowledges that Microsoft isn't going to leave the vast number of Windows developers in the lurch.
"Its messaging and PR around this issue may be crazy, and the way developers have responded is rational, but the company isn't going to alienate its enormous base of developers and force them to trash everything they've ever learned," according to Ars Technica. "Windows 8 will offer a new API, and you're not going to have to write webpages to use it."
But Foley's sources said that, among other things, Microsoft will continue to support Silverlight in Windows 8, and not just as a browser plug-in. And support will continue for other traditional tools as well, at least for now.