1 billion sats, but a bit is 100 sats.

1 bitcoin = 1,000,000.00 bits = millionaire

1000 bitcoin = 1,000,000,000.00 bits = billionaire

1 *real* dollar = 1 oz of silver ~= $19

Being a millionaire or a billionaire will return to having the proper weight to it. Yes, a single bitcoin will have today's purchasing power of $1b soon enough, but that will be because the world itself will be far grander than it is now. Standards will shift.