The downside is that Palestinians who have legitimately been mistreated in Israel have no hope for justice to prevail. Israel will keep taking their property, without consent, and giving it to immigrants. Rule of law is not being fairly distributed to all people, equally, in Israel. Will that improve now that the US formally recognizes Jerusalem as the Capitol of Israel? I can't see it improving.
While I recognize the Sovereign work of God in the events surrounding the nation of Israel, I also note that the present government of Israel is far, far away from knowing the God of Israel.