The question is if the benefit of more revenue and environmental savings warrants making the secretaries an cashiers adapt to less efficient schedules (eg come in earlier, stay later)
Increasing capacity would also result in taking more vehicles off the road.
Peak fares to encourage people to work non-peak hours if possible can shift demand enough to mean you don't need build more transit now saving a lot of money now. Eventually there is no substitution for building more, but better utilization can ease that somewhat.
There are are a lot of similarities with road congestion pricing going into effect in San Diego and NYC, and planned for LA and SF. Who will bear the greater burden, high earners who can easily pay the fee or low earners with rigid schedules.