No one here is denying the need for a DRL, but if you don't have any subway service in the suburbs, there's no easy way for people to get downtown, and, therefore, no adequate subway service. Some of the busiest stations in the system (Kipling, Kennedy, Sheppard West, Finch, Sheppard-Yonge, Don Mills, Wilson, Wardon, Victoria Park, Islington) are all in the suburbs. If all those people choose to drive or take GO instead, you lose almost half the system's ridership, meaning there wouldn't even be crowding issues that we are seeing today. Also, subways were built in Old Toronto (Look at the Bloor-Danforth line or the subway north of Bloor), and at the time they were considered "suburbs", now, St Clair, Eglinton, Dupont, etc are thriving stations with lots of ridership. Things take time to develop and you need to plan for the future.
Notice how this is a thread about a Sheppard subway extension. This is just general talk about the extension itself (including debate about alignments, priorities of where to build the line, construction methods, benefits/cons of the line), not about the DRL (except for interlines/connections) or downtown transit. Most of us here just support subway construction and are all dying for a DRL to be built, however, you can have more than one discussion at one time.