The reason they dropped CLR support was because there was virtually no interest in it.
This is one respect in which .NET's superiority over the JVM as a platform for its core languages (C#/VB.NET on .NET vs. Java on the JVM) made it worse for flexibility. Reified generics are great for implementing languages with a C#-like-type-system, but they limit the power of the type systems you can have.
There is enterprise software way more expensive than that.