Good to see this post and in my opinion it's not an worry because it's his personal account and he is also an user in a way. In my opinion this power down is done for circulation of Steem to develop the projects related to the SMT's, Hove mind, Hard Fork and other modules of One Account and One Vote and Oracle System. So i may be wrong but it's an possibility.
And many have wrong perception about the Steem Blockchain and that is they directly relate Steemit and Steem Blockchain and it has to be clear because Steemit can be shut because it's just an interface. I know that Steemit Inc have large stake but not the only Stake Holders so Steem Blockchain will continue.
Thanks for sharing this post with us and wishing you an great day. Stay blessed. 🙂