If this was one of our normal games, I would agree with you and not even be asking the question. I am concerned about adding unnesessarily to our total land area. I am around 30% right now when I abandon the "lmn8" cities I should drop back to around 27% land area.I'm generally against razing Wonder-giving cities. How many of our cities have unhappy faces? How many are perfectly balanced in terms of happiness?
Here is a chart of our cities: Orleans and Tours are going to be abandoned next turn. I am also thinking of abandoning Persepolis when its culture becomes >100 in 2 turns.
Many, if not all, of the cities with sad faces have happy face buildings available to build if needed.