The only change that has been introduced with HIVE atm related with governance is that after powering up you need to wait for 30 full days before voting.
That alone gives plenty of time to take care of the CEX trying to take over the chain. In addition and as we seen the last days, it's a pain in the ass for exchanges staking up. It would be very risky for them to try to affect governance in Hive.
That said, the system is far from perfect, and I expect a lot of imporvements coming in the folowing weeks/months.
Regards ;)