It will be interesting. Big holders are incentivise to stop development and force transactions into traditional banking, which they can profit from holding on behalf of others. Also the harder to move on-chain, the less likely bank runs are.
Miners on the other hand are incentivised to prefer scaling and increase the number of on chain transactions.
Users are also incentivised to control their own keys to prevent fractionally reserved lending which debases the value of their coins.
Fortunately Bitcoin is proof of work, not proof of stake, so it doesn't really matter how much Michael Saylor or Coinbase hold.