There is no DRL plan. The plan is put the priority on 6 to 10 LRT lines. Granted there were a few BRT lines. I think the Yonge extension was the provinces idea and not TTC, although I may be wrong.
Can you list off the 6 to 10 lines? Perhaps you're thinking province wide (Ottawa LRT, Kitchener/Waterloo, Hurontario)?
The Yonge extension has nearly as much engineering work completed as Finch. The DRL has as much work done on it as Don Mills and Jane.
TTC has considered pre-building, out of the cities budget, part of the Yonge extension. Fully funded is the provinces idea but the TTC has a strong interest in tunnels to Steeles. This is something Ford canned as it was in the 10 year capital plan until Ford required reductions in capital spending.
Sheppard and Eglinton are the only LRT projects which are ready to go. Everything else is speculation.
If you count the SRT then I'm going to count the $2B that has been sunk into the Yonge line over the last 5 years for capacity upgrades (rolling stock, new signalling system including automated driving, new control room, ...). The SRT plan is basically to keep what we already have functional.
The focus is execution on the TTC is Spadina Extension, Union Station 2nd platform, Eglinton Line, Queen's Quay rebuild (basic rebuild as far as TTC goes), replacement downtown trams, and new articulated buses.
Sheppard, SRT, and Finch are wholly Metrolinx's responsibility and I think only 1 of them will actually get built. TTC is offering advice and consulting.
The DRL (and/or additional Yonge capacity) really is the TTC's top priority for a major future project and with Metrolinx taking over other pieces it would have been under Giambrone as well.
Jane and Don Mills didn't get off the "wouldn't it be nice" board. York Region will have LRT on Highway 7 before WWLRT gets anywhere.
East Bayfront really only works as as tram or trolly bus. The tunnel would be too long for diesel and surface streets at Front & Bay too congested for a surface route to be functional as turnaround times at Union Station would be 30% of the total run-time for the route.