1 in every 820 Americans have died from COVID. At the current rate, that number would be about 1 in 650 in 5 weeks. The virus is serious and should be treated in a serious manner.
There are those that simply don't want to train or don't want to return to work. I'm quite certain they are significantly outnumbered by those that simply want to responsibly mitigate risk to themselves and others. Particularly when the necessity to certify new controllers in the near future is greatly muted by the low current and projected traffic counts.
On the other side of the fence, there are trainees that don't really care what health impact rushing their training has on others. I'm quite certain that they are significantly outnumbered by those that are unhappy about a 10 -15 month delay in their training progression but accept that the delay is justified to mitigate spread of a dangerous pathogen.