America is home to the second largest population of Jews in the world.  I don't think the regathering of Jews in the promised land will can be complete as God desires until they return.  What could possibly cause them to return?
This question has puzzled me.  But, if your scenario concerning the destruction of the US is correct (America-Babylon) then that might provide the incentive.  Frankly this is a terrifying scenario and I pray we aren't here to see any of these things come to pass.  Maybe there is another possibility.
 
Just guessing about this.  What if the US were to be decimated financially in a sudden collapse.  That could explain a quick migration back to Israel.  It could also explain a lot of other things in the news like the deaths of so many international bankers who see the handwriting on the wall.  Our impotence economically would then set the stage for our military defeat and destruction next year.  This interval would allow a timeframe needed for the burning of weapons for 7 years if in the same interval Gog Magog attacks Israel.  My head spins at the the possibilities because none of them look favorable to anyone who gets left behind.
 
Our hope is the rapture of the bride!  We can't know for sure how any of this will play out.  Things are rapidly coming to a head.  This April is fast approaching.  Today I read that the president said Netanyahu has until April 29th to sign a peace treaty.  It's all lining up.  All we can do is watch, pray and be ready.  Pray for Israel and the salvation of sons, daughters, friends, coworkers, strangers.
 
YBIC
Bruce Baber