I think the biggest problem is that since Maccon is no longer a student he's only gonna get half the screentime all the other characters in his own route are gonna have, since his appearances will be mostly limited to after-school scenes. He might get a few scenes during school but most if not all of them will likely just be him checking up on David and almost immediately running off to work.
Valient,I did not want to give many spoilers. But yeah. Now you will need a good relationship with Tom or David to get time with Maccon since Maccon is no longer a student plus you only get to have time with Maccon outside college unless he is doing something for his little brother. But I think Monchimutt will find a way to fix this without reverting the story.