That move is expected and In my opinion desired for the following reasons:

• It helps even redistribute Steem Power
• Keeps the price relatively low or what I'd consider normal for new users to buy in and invest

We are still in beta and everyone knows that the power holders(aka "whales) are few and hold most of the steem, if they "hold" on it, they will continue to be the most powerful ones in the platform so powering down is very nice of them as they are "giving up" on their influence to leave space for others to take the spot, making the system more fair.