Possible way to make up for lost vaccine capacity if J&J (and AZ) become unusable: move EU and USA resources to support manufacture of the Novavax and CureVac vaccines. Both seem to have the high effectiveness of the Moderna and Pfizer entries and neither uses the adenovirus carrier that the AZ and J&J vaccines do.
Obviously, easier said than done, and you're right that the actual danger from the adenovirus-based vaccines is not really demonstrated, but ... people are not rational actors. Look at Australia, which has already stated a policy of not using adenovirus-based vaccines.
Possible way to make up for lost vaccine capacity if J&J (and AZ) become unusable: move EU and USA resources to support manufacture of the Novavax and CureVac vaccines. Both seem to have the high effectiveness of the Moderna and Pfizer entries and neither uses the adenovirus carrier that the AZ and J&J vaccines do.
Obviously, easier said than done, and you're right that the actual danger from the adenovirus-based vaccines is not really demonstrated, but ... people are not rational actors. Look at Australia, which has already stated a policy of not using adenovirus-based vaccines.