1)
Why will they be scattered among nations that they and their fathers did not know?
1.
Malbim: This is [Midah k'Neged Midah,] like they served gods that they did not know and their fathers did not fear (Devarim 32:17).
2)
Will Hashem finish off Yisrael?
1.
Radak: The majority will be finished off.
