@spivonious:To some extent that's what they did do with WPF -> Silverlight -> WinRT, but the problem is you just can't throw out platforms that others rely on and hope they stick. It's why Google Wave was such a failure, not because it technically didn't work, but simply because nobody had any faith they'd keep it around long enough to be worth investing in and the lack of interest soon saw it killed off, a self fulfilling prophecy.
Despite their many failings at times, Microsoft have always been the most reliable when it comes to producing a platform you can expect to stick around. It's not always quite as exciting as others, not always the big shiny but it's always a heck of a lot less of a gamble.
moved to the "wow" thread.