Mono for Unreal Engine now that it's open source

Is there anything keeping us from using C# with blueprint calls to allow for a C# on Unreal now that Mono is free and open source? I know there was a push back against the Mono-UE project while it was attempted as a paid version but now that it’s open source is this something that could be supported?

I understand it would only work for blueprint functions, but personally for a C#/C++ developer like myself it would allow me to mostly work in my preferred language of C# and still let me get low level C++ access if I ever needed it. Honestly after dealing with Unity and some crippling bugs it sounds like a dream.

We already have a thread for this: