Multi-accounting is indeed one of the biggest problems right now and i don't know if we can solve it without solving the identity problem.
My proposed implementation does already counter it somewhat by requiring a proper curation strategy to increase influence. So if you are bad at curating all your accounts go way down in influence. But yeah it's not even close to perfect.
P.S.: Do you know why @good-karma and 7 others voted on your comment?
RE: What if STEEM POWER wouldn't increase your power?