Really cool. I could see MS jumping on this because of their strong association with C#.

That said, I think the ideal replacement for VB & VBA in most contexts is python. The reason is they're both high level languages with ease of learning as a selling point. Python has a massive userbase, and there is significant overlap of python and MS Office tools. Data analysts who have to deal with Excel & SQL Server are much more likely to know python than any other language outside of SQL.

It seems like python has pretty much locked up the spaces that VB was designed for.