Great idea to me, even if there are cases where it is not shown until the end of the run or after the show closes. Every time I read one of these things, I always seem to walk away with the view that it can''t be done because of the unions. Can't they see that this could probably make them more money, certainly on some shows? How many people in this country would pay a modest amount of $$ to see a 'theatrical' performance of TKAM or Moulin Rouge or The Lion King or Phantom or Harry Potter or Tina or the Temptations show or Wicked. (Of course, in the latter case, likelihood of a real movie being filmed would probably obviate against the latter).
Not everything would work, e.g., not sure enough people would pay to see most shows without serious (I gotta see so-and-so) name recognition or some wow factor to insure that they have a chance of at least breaking even, e.g., Diana, Gary, Frankie and Johnny, etc.
It would sure be great, though, either because you couldn't see the production when it was open or because you want to revel in it again. For example, I saw The Audience twice on stage, but that didn't keep me from seeing it 3 times when NT Live came around. hill I will always prefer to see the show live, there were some benefits of seeing it in a movie theatre, e.g., more comfortable seats, periodic close-ups, etc.
In one case, I have to admit that, having seen and really enjoyed an NT Live show, The Lehman Trilogy. I felt no need to see it in person. So, I dave quite a bit of money. Maybe that was wrong, but I just didn't have enough interest to see it in a cramped theatre after seeing it in an excellent taping (or what ever it was) for NT Live