the decision sounds right (I don't know much about the constitutional law) so under this ruling the michigan state senate couldn't be elected by county (1 senator per county). Although personally I think the districts should be equal at the state level for both houses.
In California we did just fine with Senators by county before Reynolds v. Sims. Now, we have a legislature that only represents Los Angeles and San Francisco, and the rest of the state gets trampled on.
Gee, isn't that too bad that the Senators now represent where the people are, instead of giving some worthless county with almost no people an entire Senator. There's already 900,000 people per Senator, your un-democratic ideas would make it worse. I believe in democracy. You do not. You are an extremist.