The Globe ran this piece today about efforts to designate the area near Pailin Plaza as "Little Cambodia." There are several quotes from the City Manager and a variety of views about the merits behind the idea.
For what it's worth, I would say that the Pailin Plaza/Clemente Park area *already is*, for all intents and purposes, a "Little Cambodia." If a designation can put it on the map as such, why not? It might steer a few visitors towards the shops and restaurants who otherwise wouldn't have known to go there.
Marking an arched entrance or spiffying up some street signs wouldn't exactly turn that area into EPCOT Center.