In terms of immigration, Israel is still in net decline: 25,000 Jewish olim arrive every year whilst 37,000 Jewish Sabras leave Israel for good every year.
If Obamacare goes bottom-up, expect a surge in American Jews trying to get Israeli citizenship in order to take advantage of the Israel's very good virtually free medical care. The fact is that Israel doesn't really want another mass Aliya wave, and they would clamp down on the the regulations & numbers let in if there was a sudden arrival of tens of thousands of unhealthy, obese, spoilt, whining, demanding US Jews, unless they come with ready $$$, which most US Jews now haven't got.
Shame to tell, but the very last Jew that will be allowed in to Israel is......Chayim, barring direct Divine Intervention!