As democracy we can choose a members from active local boards
Who's "we"? 
The community!
all we need to do is make it like democracy
You're kidding, right? Democracy is centralized. Is the forum decentralized? No, it is not! Is Bitcoin truly decentralized? Do define democracy by the way as this forum is not.
Only one member is allowed and the local board members will
vote for their leader.
What prevents someone from creating alt accounts and voting for themselves? Will you impose KYC to prevent that? If so, then what will prevent buying and selling KYC votes from the Internet? (The answer to the last one is obviously "nothing"). And even if you have a solution to both, to whom will trust the KYC data? We obviously can't publish all that data, because then there would be no privacy, which is devastating for democracy. Only existing known legendary users and Hero users will be allowed to vote. We will know who will be the one but on some of those local boards it will create a canvassing opportunity for those who stand in the election they can lure their voters with anything but the voters will be from the higher ranks.
Then you will say many high-ranking members are on those big local boards. Of course, but the member standing in the election will nominate only those who are known globally and are reputed.