Change Major?

I am a current senior at a top undergrad business school and have a full-time offer lined up with a bulge bracket doing investment banking.

My cumulative GPA is around a 3.6; however, my finance GPA is currently a 2.0. I am thinking about dropping finance and doing a management major instead in order to get a higher GPA and position myself better should I decide to pursue an MBA. Is this a good idea?