I believe this won't change much of anything. I'm pretty sure the primary reason for wrong posts to be upvoted, by a long shot, is that they sound good and may even look correct for someone less versed with Perl.

I'm drawing this conclusion from the observation of my own lack of a habit to doublecheck the facts in a post before I upvote it. I definitely know that I've wanted to withdraw an upvote on a number of occasions when someone posted a correcting follow-up to something I upvoted. All that is despite my spending much fewer than all of my votes (commonly about 25 out of 40 when I actually read PM; though lately I've been absent).

I don't know exactly what that makes of your proposal. I see the merit of cutting down on the implied must! vote! imperative regardless, so I can't really argue either way.