On paper, it was a rejection of monarchism, so a step away from centralized control - but, in the same sort of way as the Magna Carta, where they didn't make the leap all the way to popular democracy, and instead sought to partially democratize power only among the ruling class. More democratic features have been added since then (suffrage, equal protection clause, etc.), though not nearly enough. IMO we do need to completely throw the system out and start over, only carrying over things for the sake of streamlining/continuity.