2FA may not have universal appeal, but neither does voting in a losing competition with bots. 2FA could be required for anyone wanting to vote and that would provide incentive. It's getting to be a cruel world and that's due to the bots and vote-selling. People cannot idly stand aside and allow computers to run Steem, so why not include 2FA as a way to make a statement? Simple as that: only real person votes count. Period.