Except that it's exactly the opposite of what you said, (although
the results are bad). The court refused to be activist and said
that how Emminent Domain works in each State is up to that State
and not a matter for the Federal government.

Actually, the Supreme Court simply refused to make a blanket rule
stating that "economic development" is never a "public purpose." They
were being asked to interpret the "public purpose" clause in the Fifth
Amendment to take away all discretion concerning "economic development"
and, thank goodness, they refused to do so. It is up to local
governments to make their own policies concerning eminent domain for
economic development. So, just as it has been for over 200 years, it is
up to citizens to participate in the process, not just bitch about what
happens when they don't.