Maybe we will never obtain a 100% decentralization, because I think the people will start to think decentralization = anarchy but it isn't the same thing. Instead we can decentralize the life aspect as the approach with the government's institutions but it will take some time (and remember the governments can no longer be corrupt, or "bribe").
The slide from the Nakamoto Institute : https://www.youtube.com/watch?v=hPY-5SR-jPQ#t=1063
Of course they use Satoshi's name without permission to try to gain attention for themselves and they claim to know Satoshi's intentions based on cult-like reasoning and wild speculation. They call themselves an "institute" and give themselves titles like "director of research" yet they have no peer review whatsoever outside their small group of nut jobs and they sit around calling everyone else stupid like a bunch of unemployed teenagers who sit around making fun of people going to work..
You can never stop government corruption or change the fundamental nature of human society by running a blockchain . You can maybe affect certain things and disrupt some business models but it is not reasonable to expect more than that. Here is an example of how most people see the Bitcoin "wing nuts" (Note that this guy is starting a business based on cryptocurrencies and not some anti-Bitcoin person)
https://blog.caseykuhlman.com/entries/2014/bitcoin-somaliland.html
I say: Yes, you can! Imagine, that the right ethereum-agent could do all administrative work for a city! If you see a road hole somewhere, you post it on mist and then all people that are responsible for that street vote for repairing it, so the ethereum agent advertises the work to several company's that return competing offers. Everything transparent, fair and cheap. How nice would that be?
What makes it possible? The Blockchain!
You understand the problem of 51% attacks, but you don't understand the problem with democracy?
If 51% of the people control 100% of the tax-money(in fact they even control money printing)..what do you think will happen?
Something being possible is not the same as motivation to do something. It all sounds great if you live your life in a video game or a John Lennon song but this is the real world.