They are getting more demanding because it's the only way they know how to operate. The Watchtower has made it's empire off of the gullibility and free labor of others, which is the grass roots of their business model, after 135+ years of running things this way it is kind of hard to change. I think the only alternative they have is to put the pedal to the metal and bare down on every bit of free labor they can get till the shebang goes belly up.
As far as the organization in the future turning over a new leaf and becoming enlightened to their own short comings and throwing in the towels so to speak, it will never happen.