Studies/testing kidsDecrease in testing will come from vaccinated people who are no longer getting sick, but unfortunately JnJ vaccine only prevents serious illness, so these people will still have symptoms and will need to be tested to determine if they are contagious.
At the same time there will be increased testing for efficacy/safety studies on kids, with results around summertime for older kids, and a bit later for younger ones. So testing will start to decrease after that, imo.