The problem is that NYC doesn't control the MTA: it was taken under state control back in 1968. And the governor has too many other issues on his/her plate to care enough to give the agency the top-to-bottom revamp it desperately needs. No one gets elected governor of the whole state of NY by campaigning on 'I'll fix NYC's subways' as a message, and indeed some of the more recent governors (Pataki, A. Cuomo) seemed to delight in stomping all over the mayor of NYC and use that for political gain.