I would argue you get a lot more out of the experience (and for a LOT less money) by just closing down Harding to vehicles — without the canal, there would be more room for outdoor eating, etc.
Still, Worcester is a small city which means it's very autocentric... to the point that a lot of those businesses on Harding need the parking spaces for their customers. I'm not sure closing the street down at all would be a good move. The stadium might change all that. That neighborhood (Green Isle, I think it's technically called, but nobody ever said that when I lived there) is my favorite enclave in Worcester; the other two favorite areas were the strip on Highland by the Sole Proprietor and that awesome little corner where Corner Grill and the BBQ place is that all the Albanians go to.
Edit:
I didn't see you started this thread, Beeline, or all the great pics. Makes me miss Worcester. Next time you're there, definitely get a beer at Dive Bar... and check out any of the establishments owned by Vincent Hemmeter (Ralph's, Nick's or Vincent's - personally, the latter is the best, I think and exactly the kind of place I wish we had more of here). Since I'm nostalgic allow me to threadshit a little with some other recs - Napoli in Shrewsbury - best sandwiches. Corner Grill - very good pizza. Gibson's - ice cream. Dell'Ovo's - Italian, amazing tiny place. Pampas Churrascaria - what the name says.