The problem with 'too big to fail' is eventually 'too big to bail out'. The problem with not plugging systemic cracks is that gamblers and gambling addicts are constantly looking for new ways to 'game' the system. Then when one finds away, the others follow, leading everyone doing the same thing. Then, eventually you have one collapse so big it tumbles into other buildings and there's really nothing you can do, because with what is being done is you are creating a
failure cascade.
All the parts are too interconnected to be be stopped, so even if you save one part, another part fails and leads to another failure and another, until the part you saved fails too. That's basically what's happening here. You can keep wishing upon a star, but you can't concentrate global wealth in the hands of a few incestous entities and expect the party to go on forever. Eventually someone is going to OD on the infinite money drug and everyone is going to get fucked.
Honestly, people thought 2008 was it, but it wasn't. 2008 and Corona wiped out a lot of smaller banks and institutions and concentrated wealth even further, creating an even bigger 'too big to fail' scenario with assets hitting trillions. Now, its basically not a matter of 'if' but 'when' the whole thing tumbles due to lack of regulation.