I keep hearing about the so called "15 min city" but I don't know what that's even about? I was thinking that in some ways, that extension could prove beneficial to the MTA interms of adding extra capcity to the system (i.e. a new subway railyard and a new bus depot that could in theory split depolyment duties between Manhattan and Brookyln, assuming new bridges would also be built). I know if it actual does get extended, it would take 20-30 years before being complete.