Not long ago there was an upper limit on the number of games that elite players could play in a season - I think it was 30?
Deans seems to have thrown that out of the window, he has actively encouraged his squad to play as much, as often, as they can, even in club rugby.
Buggered if I know - but it seems to me that there would be an optimal maximum for every player, depending on age, position, capacity to recover from injury, etc etc.
I do not subscribe to the theory that, because they are professionals, getting paid a lot of money, living and training in "plush" surroundings (where do you live, Grievous, just as a matter of interest?) they should just keep getting up off the floor, minute after minute, week after week, without any kind of ill effects.
We have relatively scarce resources. We should be looking after them, not just exploiting them for short-term gain and assuming that their performance will not be adversely affected by overuse. We seem to be conducting a kind of unscientific experiment in pushing the players to see whether, or rather, when, they will break - because surely every single one of them will have a breaking point. I doubt that playing too many games will actually improve performance.
I would rather see them a bit under-done, going into a tournament like this one, rather than dragging their bums.
Yes, I believe that some burn-out, mental, and/or physical, is inevitable, and I am sure we saw some effects.