Uhh...this is news? We've been warned all along that this is going to double rents in formerly (but not for many years now) affordable East Somerville, Winter Hill, and other adjacents.
I bought my house in Gilman Square 12 years ago for the very reason that the neighborhood would improve when the train came in. I've been waiting a long time for this issue of Duh Magazine to land on my doormat. I'm reminded of a headline from the now-shuttered Curbed Boston site: "Somerville is Doomed to Be a More Desirable Place to Live"