Not even a win of Alinghy on the water will stop the Oracle/BMW. I mean if they lose, they can still win...not on the water, but on a US court:
"Court Date Set for "Constructed in Country"
The New York Supreme Court will hear arguments February 25th on the issue of whether the Defender's sails comply with the rules regarding national origin of racing yachts in the America's Cup. Since that date is, weather permitting, after the likely conclusion of racing in Valencia, yet could determine the validity of the match, an element of uncertainty exists as to race results. Less so if Golden Gate YC and BMW Oracle Racing prevail on the water, in which case claims of disadvantage would be effectively moot, and, although definitively settling this aspect of the rules could be helpful in future matches, GGYC would almost certainly drop their case.
The Deed of Gift, the ruling 08document of the America’s Cup, requires the competing yachts to be powered by sails and constructed in the country they represent. "