Bitcoin allows 210 trillion units. 21MM bitcoins times 10MM Satoshis. If Bitcoin was the only currency, then a Satoshi would be somewheres around a dollar in the current global economy.
The probably with a bounded currency is that it doesnt match economic growth. Economic growth is the product of innovation times productivity and population growth. It is not unconceivible that in a hundred years there may be a million CPUs/bots toiling per person in a fully expressed Internet of Things. (The current USA level is thought to be about 200 per human including cars, household appliances and cloud databases.) Either the per capita wealth is going to be vastly more than now or a bounded currency highly revalued.