MLS PIN released a statement today that a property may remain active and only be shown by Virtual Showings. Specifically: "a listing may remain “active” in MLS PIN as long as the property is available for either of the following: (1) physical, on-site viewing of the listed property by potential buyers with a cooperating broker; or (2) virtual showing (which could mean live or pre-recorded video of the listed property), during which the listing broker or agent is available to answer any questions that a cooperating broker may have about the property." If a listing is not available in either of the manners described, it should be temporarily withdrawn.
Previous to this change, an active listing had to allow for physical, on-site viewing. The change is temporary and MLS PIN will communitcate to its subscribers when active listings need to again allow for on-site viewing.
You can read the full statement by MLS PIN on the News and Notes section after login on the mlspin.com page.