W. K. Lis
Superstar
LRT would be great for Toronto's lower density areas right now, however I'm of the opinion that most of the lines would become overcrowded in a relatively short period as density increases. Subway is more expensive to build, and most areas that aren't currently served by subways don't have the density to justify it yet, but as we've seen by the "T" formation around Yonge-Bloor, subway lines attract high density development and economic growth more than any other system, and it's much easier to increase frequency on subway lines than LRT.
If the capacity on one Light Rail Line is too much, they build another line following another arterial road. For example, If Eglington gets too crowded, the Light Rail Lines on Finch/Sheppard could get the initial overflow. In the future, other lines could be built as needed, maybe along Lawrence or even Steeles.
That way the light rail lines could be expanded at a lower cost, in comparison with heavy rail lines. Reaching more people, providing rapid transit across more of Toronto.