I've also hit up that Tatte probably once a month since it opened, also largely for location and vehicular convenience (Blackbird, I usually cut through Charlestown and over the Gilmore bridge), and I'd say that cluster of restaurants seems to have some solid foot traffic already. Add in the labs and apartments finishing up soon and I'd imagine it'll reach a perfectly fine critical mass.
I'll also agree that it's better to walk than I was expecting. But now that there's some form of urbanity going up around the park, I'm not sure how much I like its meander-y nature. It was passable when the northern reaches were a wide open wasteland, but now I'm wishing for something a bit more formal in layout.