I was part of those petitioning CN to continue on to season 6. Ending with Things Change was unacceptable. Had they stopped an episode before, I would have been better about it. My issue was that each titan appeared to get a season focusing on them: season 1 was Robin, season 2 Terra, season 3 Cyborg, season 4 Raven, and season 5 BB. Starfire got some scattered episodes, but was never the main focus of any. Season 6 could have explored that option.
I haven't watched Teen Titans Go, I saw a clip and thought it was a dumbed down and childish version of the original and have no interest in it.