So the E Line is being totally rebuilt on Huntington/South Huntington Ave.
Upgrade report: https://www.mbta.com/projects/green-line-track-and-intersection-upgrades-2021
The tracks are being rebuilt in place although there have been proposals to run the tracks along the curb as shown below:
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I know there are many actual and perceived issues with the concept but other cities seem to have been successful with the design and when I saw what they did on Brighton Avenue, where they took the entire right lane for buses, I wonder if it actually could work on Huntington Ave. If you are going to make such drastic changes on Brighton Avenue for buses, then you can probably justify similar changes on Huntington Avenue for LRVs and buses. The ADA requirements alone are probably enough to hang your hat on.
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T officials have stated publically that the curb-running rendering is ancient and got used in a presentation recently for lack of a better option. They recognize that keeping the transit in the center of South Huntington is a better solution and want to make it very clear that that's the plan.