Capaldi is the exception as a mega-fan but Capaldi was not, and still is not, a massive a-list Hollywood star. Exceptionally busy TV actor but he could still do Doctor Who realistically for a few years. He's the closest we'll ever get and that's only due to his existing fandom.
Ben Williams
I see we’re back into “this celebrated actor who has rigorously worked their way over many years into a level of industry demand such that they never need to put themselves through the crucible of playing Doctor Who should be the next Doctor Who!” discourse.