How many people will get off at Queens Park to walk outside to get Japanese cheesecake? It's a 10-15 minute walk. Instead they will continue to transfer at Yonge.
2014 data:
Union - 125,220
King & St Andrew - 117,060
Queen and Osgoode - 76,890
Dundas & St Patrick - 108,280
College & Queens Park - 87,600
If I save 10 minutes on the DRL but have to walk 10 minutes at the end, it is human nature to avoid the walk. And there are 30% more people getting off at King St vs Queen St.
Ideally the DRL goes via King. And when that gets busy they build another subway at Dundas....where there is demand not "near" the actual demand.