There is no such thing as "too much resilience". What a ridiculous article. Stopped reading it when they mentioned that people staying in their jobs despite hating it are "resilient". That's not the word I would use for it.
People will adapt to their circumstances in both directions: if things become worse, people can adapt to rationalize it as normal, whereas if things become better, people will become eventually complacent and want things to improve, even though things have already improved.