several
http://thepressgroup.net/concerns-over-leonia-road-closures-...
For instance, both Lowell and Worcester in MA are each less than 50 miles from Boston, when measuring city center to city center. Both cities fell on hard times in the 20th century, but reliable rail with 20-30 minute travel times is technical feasible and would do wonders for both cites, not to mention help relieve the severe housing shortage around Boston.
Perhaps a way out of this NIMBY induced housing crisis is make more of them aware of this fact?
So, you could choose to locate a company in Worcester (or even closer in, say, Framingham), but many of the 20/30 somethings will have a tough time getting to these locations and these towns themselves don't have people with the necessary skill sets.
It's criminal the train from Boston to Worcester is slower today than it was in 1950. But that's another topic.
I do agree with you though that if new housing is only built in a small number of areas, those areas could very well see more traffic. A goal of SB-827 was to increase housing across the entire state, particularly near areas well served by mass transit, in the hope it would result in less people commuting by car.