Bitcoin has max 21 million coins, this low amount gives it that fundamental value.
Can a altcoin with a billion max supply reach $100 each?
Has any alts in history with a billion or billion+ but no more than a trillion coins reach $100 each?
of course that can happen if demand for the coin is higher than supply, I take an example using coin X :
demand for coin X is higher than supply, because demand for coin X is 2 billion and supply for coin X is 1 billion, and that makes the price for buy order of coin X will continue to increase, so that the price of coin X can increase very high.
therefore in my opinion, demand for coin is the most important thing to make the price can increase very high (reach $100) and max supply does not affect for the price can increase very high or not.