All you need is the ability to make "voting power" expensive.
In Bitcoin, you need to buy expensive equipment
In BitShares you either need to buy stake or convince people to put trust into you and set you as a proxy.
What would buying 16% stake result in? Is there even 16% available in exchanges (for sale)?
Wouldn't that also lead to passive shareholders to claim their stake and read into voting. Maybe maybe not.
We will see sooner or later what will happen when the price goes up (for whatever reasons)
Alternatively, how would you convince people to trust you with their voting power? Isn't paying for votes perceived
as corruption? Would you vote for a president that pays you $20 right away? Do you think that people with a lot of
stake (face in the game) would take the offer as well?
Why would I want to give control over to someone that I do not trust, that may do no good to the value of my shares?
Any finally, if shareholders are unsatisfied by the voting distribution, it is in their hands to change it. Similar to what Bitcoin has seen with GHash.IO.
Furthermore, Just because the proxies have a lot of voting power does NOT necessarily mean that will use it to replace witnesses and even if that happend, all they can do is halt the network.
In the end, BitShares is way more flexible when it comes to governance even though it may be easier currently to get
dictatorship. But IMHO, it is a good thing that @bytemaster can stear the boat (for the moment) and protect it from
hostile take overs. What we have seen in BitShares 1 already is that someday, he will NOT have the power anymore to
stear the boat alone.
Well you mention Ghash, where we saw hashers will continue flocking to the most profitable pool even to the detriment of their own investment.
I believe the original premise of

was the Bitcoiners would flock to BitBTC for an annual

even ultimately to the detriment of their investment.
So it stands to reason small BTS shareholders may be willing to proxy their vote for an annual

paid monthly even ultimately to the detriment of their investment, especially if they thought the pools/proxies intentions were good.
So an example of an attack...
'Hi guys, I think BTS should incentivise voting and give those that vote up to

a year funded through an annual inactivity fee for those that don't vote. Please proxy your vote to me, to give me more impact in making this change that will get more people to vote and make BTS more secure.. To demonstrate how effective this is, I will fund the

initiative myself and pay everyone that proxies their vote to me

p.a paid monthly. If I run out of money or fail in my attempt to help influence this positive change, please feel free to remove your vote. '
Then I may be able to acquire 13% stake for a monthly cost of 0.05% of total BTS. Then once acquired I elect witnesses and if it's not possible to print BTS and send it to the exchanges for sale, I will at least short BTS while the network is being attacked.
Like BTC, there may also be outside influences, like .gov or banks or competitors that would like to target BTS for 0.05 - 0.13% of stake. We already saw how Rune wanted to perform a hostile takeover of Bitcoin.
Extremely unlikely I guess, but that's the concept.