Hmm, I've done some recitals and I played out a little in some function halls on grand pianos. I'm really thinking I wouldn't do them on a digital or wouldn't have. Not Beethoven, Bach and the like anyway. Pop stuff maybe so, and in that category I think digital is already accepted.
Keyboards are good for accompaniment, stage shows, gigging, home practice, silent practice in tight apartments etc.. Can't imagine yet, any world class concert pianist showing up and setting up his Roland stage piano to play the concert ! I mean seriously ?