why not let free enterprise decide the fate of this endeavor instead of...
This is exactly what is driving these decisions. You know why Bayreuth is the only place in the world to do the full Ring cycle every year? Because mounting a 12-hour operatic spectacle is fucking expensive, and only the place with a guaranteed audience for it -- that is, an audience willing to pay a premium to see the opera in the house that was specifically built for this music -- can survivie doing it.
Make no mistake, the trends cited in TFA are not motivated by much creative interest. They are primarily motivated by cost-cutting and standardization drives, which -- you guessed it -- are the consequences of market capitalism. I mostly dislike orchestra unions -- they seriously interfered with a lot of work by myself and my colleages when we tried to compose things for orchestra that they didn't like -- but if we take your arguments and the OP's as valid, then they are protecting a legitimately valuable experience from debasement.
The best things in life go on sale sooner or later.