I'm assuming that these fans live in Astoria.
Less seats means more standing room, which means that more people can fit on the train.
Also, they are against making the C and G full length.
If option 2 is exercised the N/Q/W can get some of the r160's back in addition to getting all the r68's.
The B, D, E, F should get the r211's. The Q can borrow the r211's during the weekends, since it's the only Broadway line besides the R that gets rerouted via 6th Avenue. The R can keep the r160's. If option 2 includes 8 car trains, then those can go to the M.