For much of the past 2000 years, when most of contemporary Halacha was being formulated, there was only a single denomination\sect of Judaism. (Leaving aside Ashkenzi vs Sephardi, which is mostly a matter of minhag.) However, in recent years there has been an explosion of division among Jewry, and now we've got almost a dozen, not even including all the different Hassidic groups. This appears to be a return to the situation at the end of Bayit Sheini, and that situation is reflected in the halakha and hashkafa from that time. (For example, please see http://judaism.stackexchange.com/a/34509/880)
What are the contemporary halakhic and hashkafic implications of this trend?