Israeli teams (and the national team) play in Europe because they have problems with everyone in the Middle East. And considering what they keep doing they are having more and more problems also in Europe so Israel, both as a national team and clubs, shouldn't be playing in any competition: not for Asia and for sure not for Europe. They have nothing to share with Europe, they are there just because of politics. I'm European and I don't agree with Israel playing amongst us.
It's something that FIFA and UEFA will surely allow them to do, given that they're selling European football to the Arabs, but then it will lose value and everything that was so popular in Europe will lose its flavour and it will all end. obviously in the worst case scenario
One of the big problems with Israelis is that they create problems wherever they go. I don't know how much they are and will improve their game by going to Europe, but Europe have to be careful in advance so that they don't cause any problems. Israelis understand politics very well, so it's definitely better to be careful. In the past, sports organizations used to take good decisions, but now big organizations are considering sports as an economic tool that should definitely be avoided.