It would be kind of dumb on their part. They're competing with Java, Golang, a reborn C++, Python, Swift, Rust, etc.

They badly need .NET to get adoption outside of Windows, which is a stagnant platform regarding dev adoption.

“It would be kind of dumb on their part. ”

Agreed. However they have a long tradition of doing the right thing and then killing it immediately with stupidness and arrogance

They were knocked down a peg when they completely missed mobile.

That reborn C++ is being driven partially by the Windows team, that owns C++ at Microsoft and never was big friends with the idea of managed code on Windows.

As for Windows, being stagnant, unless one is living in SV, it is quite relevant for anyone doing desktop, laptop and 2-1 software.