I was planning on writing the MCAT at the end of August, but May dates have gotten cancelled and this might carry on throughout summer. Law schools have made a version of the LSAT, called LSAT-Flex, to accommodate students so is it possible that the MCAT will be online as well? If the MCAT was online, they could evaluate applicants who have taken the real thing separately from applicants who take a variation of it. Another possible solution would be to extend the deadline to submit med school applications!
Another speculation is that winter term grades could be disregarded by some schools because of this, but I cannot see it happening. I can see med schools being more lenient to those who chose to withdraw from a course or those that chose a pass/fail grade that were affected in some way by COVID-19.