Decentralization is about redundancy from faceless bureaucracies. The bigger an institution the further it's sight is from the people it affects. We haven't even taken small states far enough in my ecological opinion.
Bioregional decentralization is the future governance people are waking up to.
People are working on apps/sites that allow citizens within a certain distance of a metropolis to vote on issues directly relevant to them. And distance tiers will be the method by which larger continental votes can be passed.
The types of edible foods grown in downtown Boston are not relevant to Californians. The types of gun laws in Montana are not relevant to San Francisco.