Removing steem power does not eliminate voting. You can have the vote weight based on how much steem you have in your wallet.
Steem power smart contract was done to prevent double voting but you can prevent double voting in another more elegant way ( the weight of the vote would include steem that was in the wallet for more than 7 days which is the voting period) This would prevent double voting and people wouldn't have to lock any funds.
Its been discussed in this thread https://steemit.com/steem/@furion/steem-as-a-digital-currency