Golden State is the only team in NBA that is well-equipped to defend LeBron. The rotation of Barnes, Iguodala, and Thompson is about as good as you can get, and simply having 3 defenders capable of guarding him on one team is a major luxury. Yet LeBron still put up monster numbers in the finals, albiet inefficiently.
The Spurs have Leonard, but no great option thereafter. The Pacers have George, but he can't shoulder the entire load since they need him on offense. Same with Jimmy Butler on the Bulls.
It's a major problem for pretty much every team currently battling for a playoff spot. I don't expect anyone on the C's to contain LeBron, nor do I expect the C's as currently constructed to beat the Cavs. Not a primary concern of mine at the moment.