I wouldn't worry about this at all. The flight is overbooked, they will most likely get some volunteers, and you will be fine.
AS doesn't like to IDB, and will try very hard to get volunteers if needed. And if they don't, they'll IDB you, and put you on another carrier. There are lots of wide open connecting options to get you into BOS by tomorrow night.
NW via MSP, DL via ATL, SLC or JFK, and AS-AA codeshare options via LAX, SFO, or ORD.
If you're able to volunteer, even inquire about that if you're able to get to BOS later that night.