If by "centralized 'mechanism'" you mean the fact that tonych control all 12 witnesses I'd say I don't think the mechanism of changing witnesses is somehow deactivate 'till the distribution is over.
I think it's in full blow validity and someone who present a very compelling argument to be one of the twelve witnesses could assume the role.
Now, tonych may have any number of reasons to be in this role, but one would be: the network had to start securely somewhere, and the other being: no one's showed up yet with the needed reputation and credibility.
Finally some voice of reason. I felt so lonely with my arguments among all "hodl, to the moon etc." mindless cheerleaders. Thanks for that. It would be nice to hear from tonych what is his plan (if any) for relinquishing control over witnesses and breaking down the current one man cartel. It's obvious that it's very early to talk about that but some plan needs to be outlined if the system is to be considered in the future something more than privately controlled currency by one man. It's so centralized at the moment that the wallet "decentralized value" slogan sounds like a joke.
You can even now begin using my witness.
Witness 7ULGTPFB72TOYA67YNGMX2Y445FSTL7O replaces UENJPVZ7HVHM6QGVGT6MWOJGGRTUTJXQReplace the one which is the last in current list which is UENJPVZ7HVHM6QGVGT6MWOJGGRTUTJXQ
This is intended actually to be a well run witness, it has been on for a while now, the keys are very safe, it is on good hardware. Just waiting to make a real announce of the witness together with witness-policy and my background and intent with this, and need to gather more technical experience.
Of course the primary intent to run witness is to gather fees, but for me, long-term this witness will actually distribute a percentage of its fees to Wikipedia and Free Software Foundation. Using this witness you would support these non-profit organizations. I got no connection to those orgs other than being donator and have been associate member of FSF.
Choose the witness above if you want simplicity, independence, and to support freedom of software and freedom to acquire knowledge. I am one man, but have no debts, political or religious affiliations, basically am unknown in the cryptopunk or finance world. My technical skills are solid, so if I come under government or crypto-nerd pressure I can do like thepiratebay, disappear but the witness and its keys will continue serving. To see these tech skills in action, I run a witness, several hubs, created the first asset after blackbytes (called First), and left a message for the wife in the DAG like strawman.