Apparently there are posters all around. If she runs, then definitely this is only a stop gap arrangement till the Presidency. I mean Senate, SoS & then Mayor (even if it is NYC)
Apparently she will be doing a book tour this year promoting her new book & gauging the mood. I think her original idea of doing a Liberal TV Show & wait for 2020 was better than to to run for Mayor!
2020 field "Could" be weird - Clinton, Biden, Kerry, Sanders, Warren, Booker, Gillibrand, Cuomo, Castro, O Malley (None of these have ruled out a run ! )