So being scared that Xbox is going to disappear is stupid, the consoles might, but Microsoft has been transforming Xbox into a platform for years, starting with the release of windows 7 when they introduced XboxLive for windows alongside halo 2.

If Xbox disappears, so does your digital library and other purchases (some games you can buy once and get on PC as well, but last time I checked, they were few and far in between). I can see that being a concern for people that bought into the Xbox ecosystem for the last few gens.