Great thoughts and summary. However, ecopsychology has not failed until Earth is failed. Yes, we have damaged and destroyed, but more than ever before people are waking up to their senses. Our senses tell us to survive, even ourselves.
As you said, it is not ecotherapy that is needed, but whole thinking. In movies, music, art, culture, language, and most especially politics. Getting the toxic sludge out of politics, and then out of fuel systems, will give us the means to survive, even if there’s quite a lot to repair.
Never give up!