It doesn't work like that, jass. Starting with off-peak-and-weekend-only would be useless for a station that's fundamentally best for weekday peak hours. That's when the Pike and Storrow and Comm Ave all suck, that's when the B Branch is at its worst, and that's when the 66 most struggles to keep schedule. Plus, the biggest market right now is Allston/Brighton commuters and NB workers, who are aligned most towards a normal commute schedule.
Right because no one lives in the A/B transit desert and wants to get downtown and back. Or lives in AB and is coming back from an event in Worcester.
It literally costs zero dollars to stop on weekends and create new ridership and revenue. Its a 60 second time penalty.
Hell, make it a flag stop.