I don't think things will miraculously work out better, I just think that there's no good outcome for the United States either way. In other words, it's bad for us no matter who wins. Let them kill each other, and we'll deal with whoever comes out on top.Second of all, I don't think it's useful to view the conflict from a perspective of which government is preferable - Assad or the opposition. It's not useful because those aren't the options. The Syria as it was under the Assad regime - prior to the Arab Spring - is over and is never coming back. So it doesn't matter if that option is preferable because it's not an option. The possible outcomes left are not very good. But some are worse than others. We should do what we can to avoid the worse ones.
With all due respect, I find the notion that things will miraculously work out better for US interests if we don't try to influence the outcome to be a bit foolish.