I agree with your points but I'm don't think they address the same time horizon. Whats common among your points is that they show that personality traits change (slowly) over time. They do. There are thorough longitudinal studies that analyse and support this (e.g. the Grant Study). An inspirational read about this is Aging Well. But are these 'Intended' treatments or planned change? I don't think so.
I agree that the time frame for personality change is probably quite long, outside of pathological causes. And at least sometimes, social problems, depression, and anxiety can occur in more stable, quasi-personality forms. That said, sometimes a specific issue will present itself as a more personality trait (e.g. social phobia or shame presenting as introversion), with the possibility of more rapid adjustment.
The time frame for resolving addiction without third party intervention seems more mixed. I suspect selection effects cause us to greatly overestima...
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