And for many users, it'll add an extra transfer, which is quite inconvenient when you have luggage. For example, my quickest route to the airport from near the UoC is the 20 to 78th Ave Terminal and then the 300. The 300 portion takes around 20 minutes. The new connection would require transferring onto the Green Line and then again onto the airport connection (unless they extend the 20 all the way to the airport connection) - all of which will require waiting time in addition to the physical inconvenience of hauling luggage. It might get to the point where the time savings are nullified for existing 300 users.