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.
UN: Gaza could be 'uninhabitable' by 2020 if trends continue (AP)
from the article: Alienated Jews