Be careful, because banks and central banks are not the same things.

I'm just wondering if people who claimed to believe Bitcoin would end the banking system came up with that amongst themselves or were basing it on something "Satoshi" had said.

I had the impression Satoshi was relatively matter of fact about Bitcoin, but I haven't read much of his/her/their own words.

Read the white paper.

No, it's much more likely that BTC was a state funded vehicle for surveillance. Take that with a grain of salt, I could be totally wrong.