On paper the improvements look nice. I don't get the preservation portion. That adds cost with little utility.

Clean the stations, make them less grimy, eliminate the dark dungeon feel, dress up the load bearing beams a bit with a material where grime and soot can be easily cleaned.

Put in some women only cars on the crowded lines to prevent groping... Maybe one day get a north-south line to join the outer borough lines (a peripheral line). Most lines are in and out of Manhattan, as if people didn't move interborough.