Science takes time. The 2 year trials just started. No they have not just started. Example Moderna: Phase 3 study Actual Study Start Date : July 27, 2020 Estimated Primary Completion Date : October 27, 2022 Estimated Study Completion Date : October 27, 2022 9 months later isn't exactly "starting". BTW - Come Jul 2021 one will have a large vaccinated population size.