It is more asking: A) Do people have the time/money to use X products? and B) Are there X people who want to use a given product (at a given price/time point)

It is more asking: A) Do people have the time/money to use X products? and B) Are there X people who want to use a given product (at a given price/time point)? I have no doubt that there is a limit on the number of successful startups due to A and B.