I use the busses, they work well (especially w/ nextbus/gps/tracking/whatever) but... Somerville is the most densely populated city in New England, the GLX is

I use the busses, they work well (especially w/ nextbus/gps/tracking/whatever) but... Somerville is the most densely populated city in New England, the GLX is (was?) expected to carry 45k people per day before 2030. For comparison, Somerville's population is 78,804 (2013) and Cambridge's population is 107,289 (2013). Not really "shrug" to me.