With Mac desktops and mobile devices getting similar in hardware the question is how much longer it will take, till you can plug your phone to a screen, keyboard and mouse and end up with a decent desktop for most use cases.
(There are tricky questions in that for instance whether one can plug it out for a break or something and how well such a thing would recover and a question whether one would be able to separate work and private life in such a world, but all should be solvable)