There's no inherent reward advantage for voting for alts vs one's own account, in either the current rules or the proposed changes.
The only real reason nowadays to vote using alts versus one's own account under any of these rule sets is for "appearances". For example, by voting with alt accounts, you might fool other people into thinking your post had popular support (and conceivably lessen their desire to downvote the post for fear of "going against the crowd").