Microsoft knows how to build tools that untechnical people can use. They are the best at this; that's why they have the desktop market. If Microsoft can make user centric tools that have at their backend Linux tech, then they will have the best of both worlds.
Any idiot can click around Excel or Active Directory and get something good enough. That's what Microsoft is good at facilitating. If Microsoft can make the rest of the Linux stack as easy to use as visual studio code, then why should a random busy sysadmin or webdev bother with buggy Ubuntu? Windows 10 will have everything they need, with more convenience.
Microsoft isn't backed into a corner: you're resting on your laurels. They're about to Embrace everything about Linux that's awesome. Get ready for what comes after.