As of Monday 18th February, 2013, selected M2 routes (620, 642, 650, 652) will enter the CBD in the morning via the Cahill Expressway, Transport for NSW has announced.
This is a several years overdue move. Anecdotal evidence is that this has made an impact on the queues leading in to the York St bottleneck.
The inference I read from this is that these routes will not be removed after the NWRL is implemented. Given that they would not feed an NWRL station anyway, more like Pennant Hills and Beecroft they are planned to stay and hence a solution needs to be found for them.
So what of the other routes in the North West? Why would they become feeder routes?