I class 501 as an 15-20 minute route on Sunday. Anything less than that is chasing people away from using transit and having riders on over crowded buses.
Nothing wrong having YRT or MT overlapping BRT routes as if offer better connection to each system that allows riders not having to have long wait transferring from one system to another well encouraging ppl to use transit more.
501 pre pandemic was a 15 min frequent route on both Saturday and Sunday when we had the 501A still running. There's a lot more demand in York Region now and the most simplest fix to help this is to bring back 501A all day, and to extend Viva Orange to Highway 50 or The Gore Rd.
Its still infuriating that it hasn't happened yet but when it does that could put intense relief and crowd control on the 501. The A/C branches will deal with York U and riders who want to get to the subway faster, as well as all the employment areas around Keele. While Viva Orange can help for East Brampton riders going on Highway 7, who right now already deal with overcrowded Zum buses that occasionally skips their stops because the buses are beyond full. This is how Miway's 103 route works really well and complements with the 502 instead of going against it and throwing potential ridership out the window.