No. The solution is to allow downvoting the original submissions, not only the comments.
I see really crappy submissions occasionally. I just don't want them to show and I'd like their authors to refine their submitting strategy, so I just want to downvote. And the argument that I can upvote other stories instead is flawed - it'd require me to be here all the time, which is an evil requirement.
[edit: An idea which I wouldn't know about if I hadn't seen it here. For me, HN still is good enough to spend time with. But it has grown less stringent about humor and links to images, which I think reduces S/N.]