One idea could be a crossover where Mob and Midoriya meet. Mob's psychic powers and Midoriya's One For All could lead to some really interesting team - up scenarios. Maybe they have to face a villain who can manipulate emotions and they combine their powers to defeat the villain.
A great crossover often involves a good balance of the powers from both series. For example, when Reigen from Mob Psycho 100 somehow gets involved in a My Hero Academia battle. His con - artist skills could be used in a really unexpected way, like tricking the villains into believing he has a powerful quirk.
Hard to say. Maybe it will if there's enough demand and the story has more to tell. But sometimes, even popular mangas come to an end. We'll just have to wait and see.
Mob Psycho manga has indeed finished. It wrapped up with a satisfying conclusion for fans. The author completed the narrative and tied up all the loose ends.