Jury duty's a pretty important function. It's not a particularly large gathering and keeping people detained for longer without trial (as would be a necessary consequence of stopping jury duty) is a considerable imposition.
It's not an inconceivable measure, but it's not one to be taken remotely lightly - probably not until you ban all gatherings altogether.
It's not an inconceivable measure, but it's not one to be taken remotely lightly - probably not until you ban all gatherings altogether.