Why do we need someone at the top? Bitcoin is different to other Alt coins, because there is no "central" figure head to attack... and we have loads
of "anonymous" people contributing to this experiment. Everyone can run a node and have a part in the decision making. Satoshi cannot be
Nobody "needs" someone at the top, but it is interesting to be at the top, and to control this. Bitcoin is stuck now in full blocks, and the consensus mechanism will preserve this precious scarcity, just like it preserves the scarcity of coins themselves. As such, bitcoin will end up not be usable any more for small transactions ; one will need "good relationships" with miners in order to be able to guarantee to get one of those scarce transactions (only 2 or 3 per second world wide).
Bitcoin will stop being a means of payment, a currency. But it WILL be a "reserve currency" for big holders that can obtain guaranteed "slots of transactions" with miners. Miners will fully exploit this power they have of distributing, at their likings, the scarce resource which is "transaction". They may even make exclusive deals with banks and other financial institutions, that, against huge fees, these banks get exclusive right to their block room. They may "rent" their blocks ahead of time to some institutions. You, as an individual, with no particular relation to a big miner, will be left fighting for the very few "wild" blocks by those few miners still accepting random transactions (with huge fees). No more "paying stuff on the internet" with bitcoin. The scarce resource of "transaction space" will be sold very expensively in exclusive deals with big finance. The mere mortal, even if he has bitcoins in his wallet, will not be able to transact them. The only thing that he will be able to do, is to sell them to one of those financial institutions, at big loss.
But no problem he will get a "bank account denominated in bitcoin" with bank IOU.
He will be able to get his bitcoins.... but nobody will, because once the bank has transferred them to you, you can't transact any more.
So in the end, bitcoin will end up in bank vaults, and miners will be paid a lot to give exclusive block chain room to banks and other financial institutions, using bitcoin as a reserve currency amongst them. There will be Davos meetings of bankers and miners, deciding on protocol changes (in their advantage of course).