So, what I like the idea of is for your upvote/downvote power to be determined by both total steem staked and stake length. So if we made this change your Steem Power would no longer be 1:1 for STEEM powered up, but would also relate the the time-lock option you chose.

It would look like this:

5000 STEEM powered up for 4 weeks = $0.03 (100% upvote)
500 STEEM powered up for 40 weeks = $0.03 (100% upvote)
50 STEEM powered up for 400 weeks = $0.03 (100% upvote)

This would allow more equality in vote influence for people. The wealthy would have the advantage of being able to liquidate their Steem Power sooner, but the less economically well off would have the option to invest longer in the Steem blockchain for a more comparable vote strength to the wealthy person.

This would result in the concept that @therealwolf suggested, but it would also solve some of Steem's hierarchical unfairness built into the system that favors the wealthy over the poor/middle class.