I would have thought with the inputs received from Gavin Andresen, as stated in their credits, they would have understood the basics of mining pools. This natural monopoly that are being created by China and some of the bigger mining pools are still more decentralized than the fiat system.
The "failed experiment" would only fail, if the cow dies. This is the part that they do not understand. If these mining pools create a situation where they can double spend, people would leave Bitcoin and they will be left with something with no value. It is not in their interrest to kill the cow, that is producing the milk.
The mining monopoly is not a good thing, but it is not a issue, when you consider the result.
Gavin and Co. don't think mining is a centralized monopoly. They think mining is well distributed and there's no need for change.