Probably so, although if you base part of the film around Obi-Wan's misadventures and close calls with Tatooine natives and the scum and villainy of local spaceports it could help pad out a story....the film could be about both Luke and Ben.
There was a book or graphic novel from a number of years ago that depicted Luke's life being endangered when he wandered out into the Jundland Wastes with his childhood friend "Windy" and Obi-Wan had to save the two of them. That could be the kernel for a suspense story involving young Luke.