Because of the concentration of old mill villages along the rail line, New London-Worcester might be worthwhile even though 395 is not congested. In a world where we have New Haven-Springfield-Worcester-Boston shuttles connecting to most Northeast Regional trains, a few New London-Worcester shuttles might make sense. NHV-NLC-WOR and NHV-SPG-WOR running times are nearly identical, so you'd get cross-platform transfers at both New London and Worcester. But that would be an intercity service operated at minimal cost (wooden platforms at some selection of Norwich, Jewett City, Plainfield, Danielson, Putnam, Webster, Oxford, Auburn) with the intention of getting passengers continuing on 95 or 90 off the roads, not a commuter service as the CT legislators think. The only commuter value would be the Massachusetts segment for Worcester commuters or Boston super-commuters.
Providence-Woonsocket-Worcester is probably a higher regional priority - large cities at both ends, and definite commuter demand. Again, a competent public-sector operator (not BSR) could get service going relatively cheaply, given that P&W maintains its track well. Both lines would be valuable regional links in a network designed for timely transfers at the major hub stations. They're never going to be massive ridership generators, but they don't need to be.