We could easily make it so that exchange accounts can't participate in influence votes (witness and SPS). There is already a fork where this is done to @steemit account, but it is not used now.

Let's do the same for Binance and Bittrex and the others. The maturity model is good enough to prevent manipulating from other types of whales, they won't wait months to power up fully just to manipulate votes. And if they do, well they held Steem for a long period of time.