The reaction of most US officials to the flotilla incident has been pretty positive. This, OTOH is not very encouraging if you think realpolitik considerations are what bears more weight in international relations:

‘Israel less of an asset for US’

Strategic ties between Jerusalem and Washington have been slowly changing since the conclusion of the Cold War, Mossad chief Meir Dagan told the Knesset Foreign Affairs and Defense Committee on Tuesday.

“Bit by bit, Israel is becoming less of a strategic asset for America,” Dagan said in his meeting with committee.>

The Mossad chief indicated as well that the US views the Israeli-Palestinian conflict as a lower priority after determining that neither side is ready for an agreement.