Besides the deep learning part, this is already very much what working in C# and Visual Studio (Code) is like.

To get to

> new FoobarGenerator().Create(new FoobarOptions { foo = 3 });

, the keystrokes would be more like

< new Fo<tab><enter>

> new FoobarGenerator()

< .Cr<tab><enter>

> new FoobarGenerator().Create(

< new<tab><enter>

> new FoobarGenerator().Create(new FoobarOptions

< { f<tab><enter>

> new FoobarGenerator().Create(new FoobarOptions { foo =

< 3 } );

> new FoobarGenerator().Create(new FoobarOptions { foo = 3 });

Interesting idea, but it's hard for me to reconcile the potential benefits with the pricing model in that specific case, particularly if the model it's using is only trained on open source and not evolving according to the user's own habits.