I think that MS is at this point fairly concerned with the "long game" for .NET, i.e. get the next generation onboard now, reap benefits for decades to come. Or

I think that MS is at this point fairly concerned with the "long game" for .NET, i.e. get the next generation onboard now, reap benefits for decades to come. Or equivalently they noticed that .NET wasn't "cool with the kids" and set out to fix that.