1)
What do we learn from "v'Yashah Vah"?
1.
Radak: They will dwell in it forever.
2.
Malbim: This is unlike during Galus, when no one dwelled in it. It will dwell securely, unlike earlier times, when there were always wars.
2)
What Cherem will not be further?
1.
Rashi: The city will not be Cherem (destroyed).
2.
Radak: It will never be Cherem and destroyed again, like it says "Lo Yinatesh v'Lo Yehares Od" (Yirmeyahu 31:39). Malbim - this is unlike Bayis Rishon, which was destroyed after it was settled.