I think so too. The purpose of this study was to study 'Yonge Line Relief' not to study the DRL. The Yonge Line Relief study unsurprisingly found that the DRL East/Long was the best option for relieving Yonge.
Maybe it is a mistake on our parts to be trying to make conclusions on DRL West from the study when that wasn't the purpose of the study. I guess it is up to the City of Toronto to study the benefits of the DRL West.
Very true. The DRL East has a regional relief component, since a significant portion of Yonge's ridership comes from outside the City of Toronto, and is pretty directly tied to a subway extension to another municipality. The DRL West on the other hand, under most realistic configurations, is a 'local subway'. In effect, it's primary relief would be for the King and/or Queen Streetcars west of downtown. It wouldn't go north of Bloor, and even that is only is some configurations.