Launch Turn Around Improvements
Looking at the trends in SpaceX booster reuse, the typical timing between launches is less than 50 days and on average decreases with each booster manufactured. [1]
This is fast enough to comfortably get 7 launches per year from eachFalcon. At roughly 13 tons/launch, a single Falcon can loft about 91 tons/year. With 20 boosters available and no other constraints, they could put almost 1820 tons/year into LEO.
Per European Space Agency - ESA, the total mass of objects in orbit is about 11,500 tons [2], so with current capabilities, SpaceX could match that mass in just over 6 years.
Interestingly, the Space Shuttle initially had about a 55 day turn around, but after Challenger, the fastest turn around was 88 days. [3] With the 88 day turn around, the Shuttle [4] and Falcon are comparable for annual cargo lift capacity.
Of course, Starship changes this dramatically.
References:
[1] https://en.wikipedia.org/wiki/List_of_Falcon_9_first-stage_boosters
[2] https://sdup.esoc.esa.int/discosweb/statistics/
[3] https://www.astronomy.com/space-exploration/why-did-nasa-retire-the-space-shuttle/
[4] https://www.esa.int/Science_Exploration/Human_and_Robotic_Exploration/Space_Shuttle/Shuttle_technical_facts
