While the share of Jews who are Orthodox has increased over the past four decades (1.9% to 7.8%), the real movement has been toward being a Jew person with no affiliation. Over this period, unaffiliated Jews rose from 15.1% to 27.5% of the total. Also--look at the huge drop in Conservative Jews: 43.4% down to only 17.6%.
This seems to be part of the larger social trend of some Americans moving away from religious affiliation of any kind.
In a previous analysis, I found that less religious Jews are less ethnocentric.