Peter,
I have a good friend whom I have known for over fifty years and who has long done excellent B&W film work using a 4x5 view camera. A few years ago he finally broke down and went digital, with a Leica Monochrom, and he still does magnificent work with that. I don't think he ever even shot a snapshot in color.
I went digital in 2004, and visited Death Valley in 2007, getting some nice images of sand dunes, which I immediately converted to B&W (exhibiting them a couple of times.) Then last year some time I happened to go back to look at them in LightRoom and saw how beautiful the color versions looked. So I think (or at least hope) I have finally learned to really look at both versions before deciding which way to go.