I don't want to put a stop to my son's Spider-Man obsession
That could be unhealthy. Why do want your son to keep being obsessed?
The boy needs a manly superhero to look up to, Batman would be too confusing
It is good to want your child to have somebody to look up to but you shouldn't let them get obsessed with them. It could lead them to have problems later in life.
Need I explain how superheroes are the perfect role models.
I think I'm good, I do know how great superheroes are to look up to! But being obsessed with it can be really draining, it could really occupy him time that could be used for more important things like studying. How about toning it down as he grows up so he can develop more properly?