He not only would have revolutionized it, but digital technology would have allowed Welles to complete his film faster too, in order to keep them more related to the times in which they were made, which was always important to him. We can only speculate on a variety of possible reasons why Welles didn't finish QUIXOTE, WIND, THE DEEP, and others, but one likely reason is that they took too long to complete and thereby lost their relevance to his original concept for them. I saw a ptrogram recently on Elim Klimov, the Russian filmmaker who made the great anti-war film COME AND SEE. Klimov struggled for years to complete his films, and then when they were finally finished, the Soviet bueracracy held them up for years more, so that when they were finally released, they were dated and out of their time. This remark by Klimov might have applied on a certain level to Welles too:
"Without any doubt, in cinema, as in real life, the atmosphere changes very fast. In movies, styles change fast too. If a film is not released immediately it soon dates. It loses it's relevance to new thoughts, new ideas. If a film is not released for 10 years, it's a real tragedy, a real anti-climax".
After so many years, it's likely that Welles too would have had to try and think of new concepts to keep his uncompleted films from being anti-climaxes.