Instead of keeping that Steem locked in Steem Power and not using it, investing it in whatever he wants seems a better alternatice. After all, it's his Steem. There's no obligation for one to do that or the other with his/her Steem earned or bought, so, why worry about Ned's power down. If I would be in the case of the ones worrying I would ask myself what would Ned think if I was powering down?