I wonder if a slightly angled caisson from a bit further away from the track would work.
Anyhow, there's lots of ways of fixing it without significant interruptions, if they wanted to throw enough money at it. You could build a temporary diversion along the west perimeter. You could build a permanent diversion (perhaps including a tunnel and new station at Davisville. You could even mine underneath the existing track, to build a new structure, and underpin the existing track.
Whether it's worth it or not I don't know - though I'm not sure that a temporary diversion to the west would be overly expensive, particularly if it's tied in with something like redeveloping Davisville Yard into a TOC or something that would monetize it.