R4, I do not know that people go to other countries just to get divorced. Of course, if an Israeli couple lives abroad they can divorce according the laws of the country. For this reason, some rabbis reportedly look for witnesses who are not halachically qualified when marrying non-observant couples.
ZD, the problem is if they have a halachic to please their parents and then a civil divorce. BTW, there is civil divorce in Israel for couples from different religious communities or other couples who married abroad but whose marriages are not recognized by any religious community (e.g. toeva couples).