It's probably, more likely, he's simply suffering from old age.
The beliefs, articulation, his ability to reason into the 'unknown', gray and fuzzy areas, which require significant resources, to tap are gone.
All that's left is the low energy pathways which have consistently been tread: conservative, oft-repeated, echo-chamber beliefs.
The entirety of the problem could be that we place people at the end of their life in such a highly regarded place where all they can really do is reproduce traditional, common sense, view points.
There's a reason why the cliche about liberals being young and conservatives being old continues to perpetuate, and it has nothing to do with the validity of either position.
Progressive thought that strays from the mainstream, if properly examined, requires more attention to detail thann conservative (as in the status quo).
Conservative choices are optimal ways to reduce the liabilities that come from their implementation. The easiest way to escape liability is to point to prior art, and say "well, this is how we've always done it."
This is of course to make it known that the world is often affected by more than just liberal/conservative bias, but also the physical limitations any type of thought process has on the human rational decision making apparatus.