Can a altcoin with a billion max supply reach $100 each?
It may happen but right now, its impossible to happen.
Ripple has the highest market cap reached with more than a Billion supply. It reached $3.84 last 2018 with a market cap of nearly $140 Billion Dollars. By far that is the highest.
Has any alts in history with a billion or billion+ but no more than a trillion coins reach $100 each?
So far none so technically, what you are saying might not happen or it will but after a few decades.