How to break down "Too big to fail"

Bernie Sanders, the Democratic presidential candidate, seems to fail to provide details about his plan of breaking up the biggest Wall Street banks. I am not going to talk about how to break up the big financial industries, because as I explained before that the nature of the industry bounds companies together. How about other industries? During the economic crisis, the US government also bailed out GM, which is not a financial company. It shows that the problem of "too big to fail" also exists in other industries. The interconnections in other industries are easier to solve. The first thing is to increase the competition by lowering entry barriers and etc. The second thing is to break down the interconnection by further specialization in the business. Finally, there is another concern about the relationship between innovation and competition. Innovation is good and motivated by competitions. However, good innovation could prevent further competitions. Therefore, innovation should be awarded but shouldn't become another entry barrier.