Is it really that hard for a company like Microsoft to find 100 software companies / developers and entice them to port 100 quality apps on their App Store, such that those apps are available when Win8 launches? Answering no to this question ignores the reality. Microsoft can do this and the fact that they didn't shows that they are losing their core competency.
And let's be honest here - Microsoft is late from all perspectives. Microsoft is late in the mobile game, being a distant fourth, behind Android, iOS and even Symbian. Microsoft is also late in delivering an App Store for the desktop. Their only "innovation" is this hybrid Windows that can run on both tablets and the desktop, except for their sad reality that consumers expectations have already been set by iOS and Android to the point that consumers don't expect their mobile devices to run the same desktop apps they've been using ... and if those apps won't be optimized for Windows 8, then it's going to be a shitty experience anyway, hence why your apologetic argument is not acceptable for Microsoft.