You are comparing the amount of work, money, and time goes into making multiply cities with the Online updates for the map already complete.
Everything Pedinhuh mentioned required Rockstar spending money. Obviously multiple cities will fall into that. That doesn't change the fact that with the amount of money spent to make Online updates, money is spent. Just like money is earned. So, yes or no. Would a map expansion make Rockstar money? It's an easy question with an easy answer.
This. I totally agree. There's no reason for Rockstar to not release a SP DLC when there's actually much more demand for it. But a multiple cities DLC seems highly unlikely.
Under what circumstance? Under the circumstance that seven years ago, Rockstar didn't set EFLC in multiple cities? Even though seven years ago, something liek GTA V and Online wasn't a thing, and wasn't making them as much money as it is now.
Are you mistaking Online for GTA V? I don't think they said about expanding V, rather Online with updates. In fact, R* hasn't spoken a word about GTA V SP since release.
No. They said, and I quote, that "it is necessary to extend the life of 'Grand Theft Auto V' and Grand Theft Auto Online". Which is what I also said.