If only they released both Windows 8 and Windows 7 Service Pack 2, then Microsoft will know where to dedicate their resources more. They should not be driven by the growing mobile market but they should have stick with Windows 7 and improve it. Yes, Windows 8 and Windows 8.1 are based from Windows 7 but with mobile phones and tablets in mind.
A few times, Microsoft laughed at Apple's offerings, but then seriously took up Jobs' speech on the post-PC era - this is where their main focus is now. They don't want to be late to the party again like they were with smartphones and tablets. Ballmer mentioned that Windows 8 would be risk.