Trading and peaceful relations would HAVE to develop between some of the people closer to one another. There would be settlements having reason to exist for being trade hubs, real trade routes would form, etc...
As people would gain skills/power/silver, some would have more reason to move towards Boston. All the while they'd be putting their precious character at an even greater risk, with trade routes being dangerous to take And Boston being a bottleneck. It would be a true step by step process.
Maybe a sort of Bostonian nobility would eventually come to be, with only very powerful characters living in the community there?
There would be new roles to fulfill within communities like people escorting others through these busy trade routes.
Again, the closer you'd want to live to Boston, the more powerful you'd have to be but the greater the opportunities and cash flow. Only those that would commit themselves a lot to the game could achieve it.
If you had to put the world and the relations its inhabitants have with each other on a map, it would look more like a spider spinning its web with Boston at the center than it is now, methinks. But maybe I'm wrong. IS ALL OF THIS PURE RUBBISH?
In conclusion and addition I know Salem must have been studied to fit a pretty stable model as it is now. Plus this could only work if many things were to be changed, like what people can build in town, the banking system and many others.
It's just an idea.
tl;dr A simple no teleport to Boston would change the way we interact and live in Salem