My prediction is that this is all leading to getting Saotome to be the new prez in the student council, citing his ability to mobilize classmates into doing stuff. Then, being prez for the final year will eventually lead to an ending where he's so publicly loved that he'll eventually befriend the entire school and that "friend counter/ratio" that ticked up throughout the series will actually max out at the end.
Also a weird B-plot with Karasuno where prez doesn't want her to be alone when she graduates so she's trying to poach Saotome to be there for Karasuno who was there for her.
