You are doing too simple a mathematical operation. Where is the demand in your equation? What happens if the demand is multiplied by 1,000 or by 1,000,000 in those 120 years? Bitcoin is a scarce commodity of which there is less and less new supply. To think about how much the price can go up you have to factor in how much demand can go up, and also inflation in the fiat currency of reference, although I think like mk4 that the returns in percentage terms as the cycles progress will be lower, and I opened a thread about it at the time.
Only the halving hype on social media will attract so many new comers into the cryptocurrency industry, and the people trooping in are the ones that increases the price of bitcoin.
While, your statement is right, the calculative application is wrong and that is why your result is also wrong.