This is an interesting analysis which correctly identifies part of the problem with conversion which involves the conflicting policies at federal, state, local, and institutional levels. It reveals bias when it starts to talk about “less efficient diversity” which is true in the analysis assuming current technology and grid structure.
Changes are happening in grid structure and the technology to support those changes.  Whether we have a relatively complete transition in the next three or four decades that will benefit the environment and the consumer will depend primarily on whether policy differences can be resolved.