We already have unbalanced demand in the existing LRT lines, especially the northeast vs the west parts of the Blue Line, which some years ago were 2:1 in terms of ridership (the red line was 1.6:1 for the south vs the northwest). The answer is to run better service for some segments than they theoretically deserve. This is particularly less of an issue with the Green Line being a separate right of way, so it's not having to take away space from other lines. Even a low ridership LRT trip is still a ton of people to be transported by one driver. Part of the point of LRT is that the capital costs are high, but you get really cheap per-rider operating costs. Even the equivalent of 10 people rattling around on an existing LRT car is still 30 people per train, which is full seated capacity for a bus.
It is operationally possible (depending on very specific details of the line) to short turn some trains, every second southbound train could in theory turn back at say Ramsay (if the trains are at say 5+ minutes headway). But it's really not that useful; you don't save that much by not running a train for an extra 15 minutes to the end of the line, and it makes everything more complex.