In the past, I've supported the idea of an express bus between Bridgeport Station to South Delta Exchange to service the Tsawwassen Mills, but over time, I've realized that the Tsawwassen Mills now has a free express coach service from Canada Place that stops by Bridgeport Station, and it would be more cost effective for TransLink to add the 601 onto the FTN, rather than having a dedicated express bus to service the Tsawwassen. With that said, if you re-route the 601 via 56th street instead of 52nd street, you essentially disconnect all reliable transit service to the Tsawwassen Mills. The only way people could get to the Tsawwassen Mills is via the hourly service of your proposed route to/from Bridgeport Station/South Delta Exchange via Tsawwassen Mills, or the 620, which is also an infrequent bus.
As for Richmond, I really don't relish the idea of the 401 and 405 being split into two routes and the 480 being discontinued. I do think that service will be needed on 6 Road in the future though. There is absolutely no transit service on 6 Road below Highway 91 currently. Routing would look something like this: https://www.google.com/maps/d/viewer?mid=1MSTuQ7siuJzSin5Jdvwvpf3Hg7s&ll=49.18017621341151%2C-123.1180968572998&z=14. Service would be somewhere between an hour during weekends and off peak weekdays, and 30 minute frequencies during peak times. I know it's mostly farms along 6 Road, but Richmond is ever-expanding, so there could be some use of a 6 Road bus in the future. Comments?