I'm very curious if the "ActionScript-to-C# transpiler" will actually work as well as he's hoping.

I'm cautiously optimistic that it could work.

It's been quite awhile since I've written ActionScript [1], but I remember when I wrote it I didn't write it significantly differently than C#. You still have similar Java-style OOP semantics with types that I think wouldn't be too hard to map into C#, especially if you're willing to be dirty and use reflection.

[1] Gah, has it really been almost fourteen years? Time is stupid.