This discussion confirms my opinion that passenger and freight service do not mix well. East of Worcester works much better than it used to when it was dispatched by CSX although there were fewer trains. My vision is that the next step going west should be be a new shortcut to Hartford, built parallel to the Mass Pike and I-84, creating a Boston-NYC route better than the shoreline. After that construct a new line next to the Pike from Sturbridge to Palmer and then next to the RR into Springfield. This would bypass the circuitous historic B&A, now largely single track and save several miles.
Of course, all of this would require electrification, which I am a huge fan of, but I don’t realistically see this happening for 20 years.
Connecting Worcester to the NEC I think is a great idea, and maybe would allow for additional trains daily (and more chances for BOS - NPY express trains).