I've intentionally chosen Windows 7 + Windows Server to run my IT infrastructure, but the majority of the factors that motivated that choice were not due to much real work on Microsoft's part. QuickBooks, an internal Access database, our bookstore's POS software, and CAD software. All are needed, none of them run on Linux (and most of them don't run on Macs.)
Windows being the best choice of operating system is an entirely orthogonal issue from Microsoft being dead.
So your reasons for choosing Windows have everything to do with third-party software that only supports Windows, and nothing to do with Windows itself.
From a strategic perspective, that should be scary to Microsoft and anyone who is betting on Microsoft.
If teleporters were invented today, chances are that you wouldn't be able to afford one for the next 20 years.