Kindle and Book Signings

I was going through my book case recently and noticed a few books that I have had autographed over the years. I couldn’t help but wonder what will happen to the book signing when most copies are digital? Does the autograph market guarantee that a certain amount of books will always be print? Does a stylus tracing over an Ipad have the same market value as a signature? Same emotion appeal? Pondering the future of a signature in general. Does a digital signature make you less emotionally committed to a contract?