Before Vienna Imperial, I don't think there was much discussion about the benefit of 100 velocity layers, but of course the result is astonishing. Perhaps we'll see orchestral instruments with more velocity layers, although it was necessary to have a machine play the Boesendorfer to get the velocities accurate enough- so I don't see so many layers in the near future. With Dimension instruments it's possible to simulate the effect of intermediate velocities, but it would be fascinating to hear what more layers would do for the solo instruments.
I'd love to know what's going on behind the scenes at the moment.