Thesis for a research paper on "breaking up the big banks"

I am about to write a research paper on the pros and cons of breaking up the big banks, are the banks "Too big to fail" or should they be allowed to fail, and I need a suitable thesis statement, can some one help me or offer some suggestioins?

I dont know much about banks but I do remember from my us history class last year about how it helped the government out. I vaguely remember that JP Morgan was able to give the government money to help bail them out. I guess what I am trying to say is that I would go the historical route. The bank was powerful and large enough to help give huge amounts of money to the government, though this could also be considered bad. I think youd have real life examples as well as evidence on the effect of large banks back then. Hope this helps a bit, your thesis sounds kinda tough :)