The CEO of one of the world's largest banks calling Bitcoin a fraud is like the Post Office calling email a fraud.

It threatens their existence in a way that nothing ever could before.

Technology can be like that sometimes.

Adapt or die.

They won't go down easily, they've had control over societies for thousands of years.

And honestly, in the end, they will adapt.  But they will be very different than they are today and change is scary for many.