Edit: Blocked the author's name, because it's not my tumblr. I didn't expect so many people to misinterpret it and respond in this way.
Edit 2: This is not from the same author, but it's a reply to them. I think it might help clarify the post for those that are confused:
I normally don't worry about usernames on tumblr, but since there've been some really out-of-pocket misconceptions in the thread, I don't want anyone to harass them.
No, the Jews that are already there can stay. More can immigrate if it fits into the national agenda. They just live in Palestine and have to participate in a real democracy instead of an ethnostate. And yes, it must be safe for both Jews and Arabs (and Christians, Beduins etc.).