keep dreaming. with a limited supply of only 20 mil it will likely take decades, if it survives that long.
eventually the banks will come up with their own universal form of payment, its just a matter of time.
They already have...it's fiat currency and it's destroyed economies and wrecked planets and bankrupted societies and it has failed in every nation who adopted it.
Once general society understands they're not obligated to use a forced currency and can choose, the only thing they will choose is the secure bitcoin that gives them back their power, control and wealth.