That's another thing that the fans are wrong about, Chi Chi's not to blame for Gohan doing that, Gohan unfortunately doesn't like fighting as much as his father. I mean look at how traumatized he gets throughout Dragonball Z, I can't blame him for just wanting to be a normal guy, he's been forced to fight since he was 4! Yeah the guy has potential to surpass his Dad, but that doesn't mean he actually does when he only has a mild interest in Martial Arts.
My interpretation is that if Gohan was to be the main character he would be forced to fight because he's forced to, not because he wants to. Gohan himself would ultimately want to be Normal, but if his Dad were not around to pick up the entire DBZ universe's slack, Gohan would not be able to afford having a normal life and going home to be a family man.
So no it's not Chi Chi's fault, Gohan is just not a hard core fighter like his Dad is. He has an interest in Martial Arts, but he's not a fanatic and obsessed with it like his Dad and the others.
Besides can we really blame Chi Chi for you know, actually being a Mom? I mean she's abrasive don't get me wrong, but do you know any mom who would be okay to send their only child at the time to an unknown planet where he could be killed of disapper forever? Would any good mom actually say they can do that without resistance at Gohan's age? And don't get me started on how Goku and Vegeta get father of the year awards. Oh wait, no they don't because both of them are terrible Dads. I mean Goku is one of the nicest people you can talk to, and he obviously loves his family but he's honestly not a good Dad. And you know who doesn't become a terrible Dad? Gohan, Gohan is not a terrible Dad because he's not another Goku.
Besides if Gohan didn't become a Scholar he wouldn't write his book in the future that revived an interest in True Martial Arts and Ki Control again which also made Tien, Krillen, and Trunks and Goten open up Martial Arts Schools to teach many new generations various forms of Martial Arts and Ki Control. I mean you have to admit that's [tornado fang]ing badass, he started a freaking movement, even Goku couldn't do that!
http://dragonball.wikia.com/wiki/Groundbreaking_Science