I don't know about Throggs Neck but for Dyker I would say not as much as it used to be (always been a lot of Irish in Bay Ridge and Dyker though). And Howard Beach maybe... Those two neighborhoods are so far from Manhattan they may as well be a suburb.
My main point is that although there may still be older Italian people living in these neighborhoods, most of the new residents are not Italians.
there were not 100% italian neighborhoods even in the past, aside maybe little italy in the 1920s, they were mixed up even in the past, like bensonhurst in 1960s where lived jewish and irish too... there is still a sizeable italian population in the areas that i said
