There are two separate discussions here. One is outside the scope of this thread.
While it may be true that the Israeli Constitution allows for the election of any Israeli citizen to the office of Prime Minister and President, in practice I doubt that this will happen in the near future. One can never say “never”. The religious parties have a strong influence, even though they may be small, in the political life of the nation. There are still questions about Rabin’s assassination. Some feel that he was assassinated because he “yielded too much to the Palestinians” and in their eyes this was inconsistent with the idea of a Jewish State.
At the risk of having my grandfather come back to haunt me, I favour a Democratic Jewish State. I say at “the risk” because my grandfather and my mother, though Jewish, were very much against the creation of Israel. The strongly believed that it was not meant to be and that it was being pushed by the Americans and the British, rather than by God. That’s why my grandfather immigrated to America and broke all ties with is brothers who migrated to Haiffa. When Yishak Rabin was assassinated my mother said, “It’s not going to happen. There are too many fundamentalists on both sides (Palestinian Muslims and Israeli Jews). Personally, I would like to see it work.
As to the Law of Return, I do believe that the law needed to be reviewed. Many Jewish converts to Christianity were killed by the Nazis and others, because they were Jewish, regardless of their faith. Edith Stein is one example that comes to mind. She was a Carmelite nun who was sent to the concentration camps because of her Jewish heritage. Could people like her have been spared by the Law of Return? It’s too late to answer that. But it’s a legitimate question. In the case of Brother Daniel, he was granted Israeli citizenship, as a naturalized citizen.