Not many, because so long as Malvern St. (with its
virtually unusable intersection at Packards Corner) is the only spanning street to the south on the grid, you pretty much can't mount anything except a super-inconvenient loop-a-thon off Cambridge St. like the 64. BU cockblocking a Babcock connection absolutely
cripples the crosstown connectivity. I'm not even sure how that LMA jitney in their plans is going to function at all given the fact that it has to bang a left at Brighton Ave. from that godawful intersection. And if the Cambridge St. loop-a-thon is so inconvenient and schedule-destroying that it's inappropriate for a frequent and load-bearing route like the T66, you're not going to get much in the way of high-frequency linkage from anywhere. The multimodal connections at this station are almost entirely dependent on a dedicated Urban Ring ROW coming through off the Grand Junction. Yes...fine!...do leave a future provision (
not an overbuild, but a future provision) for that. But the hope-and-a-prayer GJ Purple Line dinky extra RR platform isn't that provision, either.
The only other thing that's been talked up in the official discussion to-date is more hope-and-prayers stuff that intercity coach buses will opt to pit-stop just a couple miles out from South Station at West...for reasons. And even that was not mentioned in the most recent meetings, so I think they know what the odds are and have become loathe to overplay it.
It's very hard to see where a busway overbuild will serve them in the future. The grid just...doesn't work...as presently envisioned for fashioning useful bus connections anywhere except for maybe the Harvard and MIT jitneys. You're either detouring and looping to schedule-destroying absurdity or going through street infrastructure not in the slightest set up to handle transit routes. Maybe if Babcock were put back into the plans you'd have a leg to stand on, but that ship seems to have thoroughly sailed. One hand doesn't seem to know what the other is doing with this project, as the overbuilt busways seem to be residue from an earlier era when there
were more spanning streets planned to make the grid semi-functional. I'm all for provisioning, but this isn't provisioning smart. They literally can't explain how the buses are supposed to get there. Get there even with the paltry collection of routes they'll actually go on-record saying will use it. That's extremely wasteful planning that is going to further delay this station into oblivion when the already scary-high cost jumps several more times, and we shouldn't let 'fear' of some magic-bullet must-have future bus route that we can't possibly crayon on this grid drive the waste.
The whole works needs a serious reckoning. I want it built as badly as anyone, but not with this excuse for a process.