Many white ethnics are now wealthier than WASPs on average, because so many technical WASPs are in Appalachia and the South. So a lot of "white ethnic" communities lost the working class profile that used to define them.
Even in the 1970s I think white Catholics had caught up or even surpassed white Protestants. Of course white ethnics did not interact with the whites of the South and Appalachia. The "WASP" moniker was used in places where distinctions among whites exited.
IIRC, Irish Catholics were the most affluent and educated white group after Jews then. Which makes sense - they had been in the US a long time and they were disproportionately concentrated in the Northeast and few lived in the South and Appalachia.
Some white ethnic continue to be fairly unassimilated and disproportionately poor and working class, including Portuguese Americans, and people from the Balkans.
There are more immigrants among these groups.