This is a great starting point for a discussion about Jewish assimilationism in the 21st century. One point that I will make from the onset, I believe that assimilation now has a different impact than it did in our parents generation.
In our parents generation, assimilation was something scary, it was a "boogie-man" that we needed to fear, and we needed to try to make sure it did not affect us or our families. This is how I was taught about assimilation. I sense this notion, still, in the post below.
I believe the view in 21st Century Judaism will be that assimilation and even some conversion from Judaism will result. This is not necessarily bad. There will also be conversion to Judaism. So even in terms of numbers, I expect the reform movement to grow.
As far as the affect of assimilation of the observance of Halacha, I believe this will continue to be re-defined. We have discussed this before, but let me clarify. The emphasis of Halachic observation in reform is observance of the ethical Halacha. I see no reason for this to shift even with assimilation. So this boogie-man is easily killed (similar to killing the Buddah if we see him on the road.
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Does everyone therefore agree we should not worry much about assimilation ?