If this download capacity could be perfectly distributed it would enable 260,000 people to have maxed out 100 Mbps simultaneous downloads. Most people will average about 10-20% of their available capacity when they are actively using their systems. Ten times as many people could be served at the same time with throttled speeds averaging 10 Mbps. The current 1578 satellite system should support up to 1 million super heavy users or 10 million moderate users.
SpaceX is launching about 240 satellites per month. This will mean that SpaceX will have about 3400 satellites in orbit by the end of 2021 by sustaining this pace. If SpaceX is able to increase the frequency of Starlink launches to once every four days then they would have 4400 satellites deployed by the end of 2021. If SpaceX is able to increase the Starlink launches in 2022 to once every three days then they would have 7200 additional satellites deployed by the end of 2022.