But it is unlikely that they will overturn all of it and certainly, short of removing their bechira and individual n’tiyas neshomo, there is no way to guarantee that they will pasken like Bais Shammai in every instance.
No one ever said they will pasken like Bais Shammai in every instance. Like we say now, the Halacha is like Bais Hillel, but there are still exceptions.
As far as bechira goes, if a member of the Sanhedrin understands something a certain way, he ‘must’ pasken that way. That’s why ?????? ?????? argued with ????? in .??? ??, as explained in footnote 62. Does that in any way remove bechira?!