One factor out of most anyone’s control will be how many theaters are left when the dust settles... They’re sitting on tons of sometimes $$$ real estate, leased and/or aging equipment, etc. “Tenet” wasn’t the savior they expected it to be, and things are looking unlikely for ANY big releases over the next six months. (Marvel also just announced “Black Widow” being bumped to next year too; not a surprise.)
Theaters also never had a chance to recoup all of their fairly recent renovations — converting to assigned seating, new cushy/powered seats, upgrading screen/theaters/systems to Dolby Cinema standards, dine-in build-outs, etc. And many hadn’t ever even really recovered from the the last decade’s roll-out to digital’s costs. Most chains (especially AMC, the largest) have been in major debt with overseas investors keeping them afloat; that isn’t sustainable with no/little income for the foreseeable future. My guess is that by the end of ‘19, a good percentage of theaters will sadly be DOA and most people will see WSS, ITH, etc. at home anyway. 