As for the company, we've got over one million lines of c#. As new subsystems appear they are being moved to other technologies (Angular + Java + Jersey + maven + guice + Jetty + Redis + postgresql). This takes time. The amount of code is tiny compared to the old implementations and the time to market and reliability is awesome.
As for me, because I'm in charge of the migration. When its gone I'm not even going to go to the funeral.
I'm more sorry for those stuck on .NET + Windows stack.
Been there done that. Modern Java + its ecosystem blew .NET + Windows out of the water, the earth, the solar system pretty much.
PS: Language syntax is probably solving 1/10 of my day-to-day needs. That is to say while C# might have a nicer features in terms of the language, the rest (lib, jvm, tools for jvm, IDE, frameworks, portability) are way below Java.
This. Most of the code I write is gluing stuff together rather than inventing new things which is what I'm paid to do.
A lot of people say this stifles creativity and is boring but the productivity is off the scale. I've built things that would cost £50000+ in dev time and licenses and take 3 months in .net in a couple of days in Java without spending a penny (reporting, messaging, email processing, document scanning, parsing, bulk processing, ETL, matching, logging). This is because someone already did the leg work and released it with an open source license meaning no license cost. Not only that, the ecosystem, Unix based deployment platforms are all easy to automate so jobs only get done once and stay working. Sure you can throw out an ASP.Net MVC web app quickly but that's the easy bit.
We can put £500,000 a year back into open source projects through time investment and donations if we replace .Net and still do better than break even on the dev cost.
As for me, because I'm in charge of the migration. When its gone I'm not even going to go to the funeral.