I'm not sure how much more funding it could possibly get? Even before the pandemic, the T was only pulling in roughly a third of its operating expenses in revenue[0], meaning the other two thirds was paid for by other sources. Notably, operating income wasn't even enough to pay wages and benefits for MBTA employees.
The majority of those "other sources" was transfers from the state sales tax[1], meaning people living in Worcester, Springfield, Pittsfield, and Chatham were contributing to a system they don't use. Since the pandemic, public transit systems all across the country took a huge hit in ridership, and received federal funding as well, so now you have people living in California, Kansas, and Mississippi all chipping in, too.
Now I understand that taxation provides for the common welfare, and everyone subsidizes everybody else at some point, but with Greater Boston having the fifth-highest per capita income of all metros[2], I find it a little strange that the T requires such a great subsidy.
[0]: https://www.mbta.com/financials/audited-financials
[1]: https://www.mbta.com/financials/mbta-budget
[2]: https://www.statista.com/statistics/610026/us-metropolitan-a...