There are only-partially-understood immune processes that go by the names 'trained immunity' or 'bystander immunity' - where encountering one infectious agent (

There are only-partially-understood immune processes that go by the names 'trained immunity' or 'bystander immunity' - where encountering one infectious agent (including just an immunogenic vaccine) can "rev up" the immune system to be more ready for other infections – even those of very-different types. For example, there are preliminary indications that flu vaccines, Tuberculosis vaccines ("BCG"), & Measles-Mumps-Reubella vaccine ("MMR") may each decrease Covid-19 infection rates or severity-of-cases. Given that, letting usual immunization practices decay under Covid-19 disruptions is double-destructive. If anything, other vaccination schedules should accelerate, even towards a point of over-vaccination.