A black swan event can justify changing a prediction. Musk couldn't know in 2019 that in 2020 and 2021 everybody would pass much more time at home, nobody would

A black swan event can justify changing a prediction. Musk couldn't know in 2019 that in 2020 and 2021 everybody would pass much more time at home, nobody would travel to the airport or to the workplace for months and therefore the number of taxi customers would run dry overnight. None of us would be able to predict that. Stop and rethink your plan seems reasonable in this circumstances.