Limited lab access is a lot easier to safely implement with shift reservations and people looking after each others projects than classes, so I'd expect that to happen to a degree. At least some universities here in Germany already do allow occasional lab access if needed, with appropriate precautions.

You seem to be very convinced of this. At my institution, research activities has resumed for the past month (albeit with restrictions on occupancy).

I know a few grad students at 'closed' campuses currently. Though the admin says the labs are off limits, the PIs are turning blind eyes to it. The labs are effectively open.