In September 2016, Route 106 was revised to run like the old Route 42 between Rainier Beach and Downtown. Some people like this new routing, but many people think it is redundant to Route 7 between Mt Baker and Downtown. During that time, Route 9 was cut to run only during peak hours. Many people depended on Route 9 to get from South Seattle to First Hill. I have also seen throughout comments sections on STB that some people want Route 106 to serve SLU by using Boren Ave.
I have made several proposals for a new Route 106 routing:
Between Mt Baker Station and Capitol Hill, Route 106 will run like Route 9 during weekdays only. On weekends, Route 106 will terminate at Mt Baker Station. One disadvantage of this plan is that it is duplicates Route 7 and the First Hill Streetcar.
South Lake Union
North of Mt Baker Station, Route 106 will run via Rainier Ave, Boren Ave, and Fairview Ave to South Lake Union.
Between Mt Baker and Downtown, Route 106 will run like Route 14 (without serving the tail). The main disadvantage of this plan is that Route 14 is a trolley route, and it would not make too much sense to run a full-time diesel route on streets with trolley wire.
Comment below which one of these proposals you like the most. Also feel free to add your own proposals in the comments section too!