You don't mention the substantial movement in America toward traditional orthodoxy. I don't know the numbers, but they sure do have a lot of children. It may well be that between assimilation and low birth rate, by 2050, or maybe 2100, the population of American Reform Jews may be negligible, but I believe Orthodox Jewry will be thriving. Not sure how I feel about that, but that seems to be the trend.
One student killed, three wounded at Arizona campus during fight (a)
from the article: Alienated Jews