If this happens, my personal prediction is that you're going to see a huge outflow of top senior bankers over to firms like Jefferies, Houlihan Lokey, Greenhill, Evercore, Moelis, Perella Weinberg, etc. etc. Any firm that did not take government aid may be able to poach top talent and increase their size/reach, and may become a more desired employer than the former bulge bracket.
As far as me personally, I will go wherever I can get the best experience and the most exposure. If that happens to be the bulge bracket, and if I make $125-150K instead of $350K, so be it. If all of the dealflow is going to the firms I listed above, I will be looking at them instead.