"Moderate Spanish ruling"

What do you think about all the recent talk about the revival of Sephardic voices on things? On the one hand, such changes in halakha are true according to your system, on the other hand, in the end, Ashkenazim were 90% of the Jewish people before the Holocaust (Wikipedia), so really, for example, when Rabbi Chaim Amsalem grants his permission for mikvahs based on Sephardic rabbis, how can I rely on that at all? Western rabbis are a tiny minority in the Jewish people (they are not even all Sephardic).
And in this context, this is really another question. Does the fact that it is permissible to rely on the opinion of an individual in times of stress mean that he is right? Or is it simply that if he is a minority, I am not allowed to rely on him even if in my opinion he is right and in times of stress it is permissible (to the opinion that we should listen to the preachers of our generation from one side to the other, many may lean, not necessarily from one side to the other, which is the middle opinion among the first to fish in Haran's sermons) but that does not mean that he is right and if I relied on him and he was wrong then I was screwed.