I'm not sure if it is really so

I'm not even sure if the bankers you refer to actually agree on Bitcoin (as it is the only cryptocurrency which can be loosely considered that defense) having been created for protection against financial and economic crises. In simple terms, it still remains to be seen whether it will ever live up to that function in case there is a real economic meltdown coming about. Being mostly a speculative asset, it is a plausible assumption to expect it to crash along with many such assets in an economic crisis. But maybe that's not what Satoshi envisioned after all