Personally, I don't put much stock in 20 year projections, unless directly driven by rules and regulations for desired output. Things cycle in life, they go up and down like the weather, over time. As for mongering, I suspect the hayday has possibly peaked, as GDP, goods and services improve in TH, lifting people up and more and more reasonable alternatives become available. Nature says all things come to an end. The TH model is successful and a bit surprising that TH has had an monopoly.
Essentially, the money is to good for the political controlling class that share in the wealth. Therefore, without a replacement, greed will be a strong incentive not to cook the golden goose.