Yes but when would _that_ happen? Growth will slow down when:
1) Either they have captured almost all of the market
2) Or they have a better competitor which washes them away
Iff (1) happens, they will not go under as they will a 'large' bank and will most likely be 'too big to fail'.
Iff (1) happens, they will not go under as they will a 'large' bank and will most likely be 'too big to fail'.
And I don't think (2) is happening fast enough.