I rather see this a problem of the current KNC holder community rather than a DAO design. Just imagine if the DAO is able to collect more fees that worths people of staking for themselves instead of putting on binance, it would solve this problems.
On the other hand, there is no way for us to block any specific users because they can just change their addresses and participate again. Quadratic voting power might be a “better effort” to lower the gap between whales like Binance and the rest, however, It is an overkill for now because the Kyber Team still has great power over the DAO (creating the actual proposals). Later on, when the community and the team are both ready to transfer that authority to the community, quadratic voting might be a good option.
P/s: even for quadratic, people can just split their voting powers to different addresses to optimize their voting outcome (reward and proposal consensus).