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The masks do present a concerning double-bind in that they would presumably prevent patrons from consuming concessions, which accounts for a significant amount of a theatre's revenue. Between that and the reduced number of available seats (which in and of themselves would be hard to enforce - does every session have to have a staff member posted at all times to ensure compliance, which in itself might be a further expenditure?), theatres might simply be too unprofitable to open under the current circumstances. Maybe the content creators get a better deal on their end, but in all probability the theatres themselves will be left out to dry. Like I'm pretty sure a six-foot radius equates to two full seats so that's every third seat of a row, then there's the question of whether you leave entire rows empty to ensure that the distance extends up and down the rows instead of just across them. Too many variables, really.
In any case, there's a local chain that's planning on reopening in two weeks and Tenet will come out four weeks after that, so I think that'll be enough of a trial period to figure out whether or not this is even remotely viable (and I live in a country that seems to have done a fairly decent job of flattening the curve so far, though we'll see how much that matters by the time Tenet drops).