No, it wouldn't have. Nor was that a significant issue.The banks ain't your freaking enemy. They lend money for cars and homes. If you want to consider how bad it can be under moderate socialism just revisit Barney Frank's claim that Fannie Mae was solvent when it was on the verge of collapse. If you want idiots like Frank controlling the production and sale of goods and services vote for Sanders.
The issue was the banks investing shareholder money in derivatives. GS possibly would have limited the number and type of banks doing this