I think that the situation of Chanukah of old could happen again if we are not careful. Most Jews are assimilated already. Those who are not, are still exposed on a daily basis to many of the issues that were prevalent then, the immorality, the obsession with looks and fitness, etc.
There are countries that have tried to prevent Jews from shechting meat and from doing bris milah, under the guise that both of those are INHUMANE. This, while they are busy doing G-d knows what to the Jews and other minorities in their countries. Yes, I do believe if we are not careful, Chanukah could most certainly chas v’sholom happen again. the question is – are we up to the challenge?