I can see a problem with a high rise condo or apt building. We have two elevators here, but only 16 floors, 3 of which are parking. We're supposed to be only two on an elevator, or one family group. That means you can wait a bit, if you abide by the rules. Most folks ask, and if you're masked they let you on.
I we lived in a 40 story building like the ones next to us, that becomes a problem even with more elevators.