TOareaFan
Superstar
I believe that the Milton line has the potential to be the busiest GO line per kilometre of track. The fact that many of GO's busiest stations are on the line, with only 6 rush-hour direction trains a day, is extremely telling.
and I happen to believe that no line has anywhere near the potential that Georgetown has.
For one, it is the only line that serves Brampton....a city of nearly 500,000 people...scheduled to grow (unlike Mississauga) by another 200k or so.....largely a bedroom/commuter city (although it does have a decent employment base). Add in that it also serves North Mississauga, North Etobicoke and Weston...and you have an above average (by GO standards) population base and density (I think in the Metrolinx report only Bloor Danforth subway had higher average densities...might be wrong there but it was near the top)
For 2.....with new stations at, say, Black Creek & Eglinton (+/-)...Woodbine...Liberty Village.....it has the potential to be poster boy for Transit integration in the GTA....and can improve even further on those average densities.
For 3......aside from the obvious downtown Toronto (which all GO lines serve)...this is the line that will hit the most "drivers" with serious two way potential.......@ Woodbine it reaches a racetrack/slots facility (that few doubt will one day be a full fledged Casino) and that whole new massive Woodbine Live development.....@, both, Woodbine and Malton you have potential for very easy links to Pearson Airport.....@Liberty Village you have the Ex, BMO Field and Ontario Place......
If the GTA was a blank slate with the current populations in place but no commuter rail line and someone was asked to design just one line.....it might not be exactly the Georgetown line but it would be closer to that line than any other.