I overheard part of a news report about the downed F-15. I only caught a little bit, but dang, it sounded a bit like the reporter was cheerleading the Iranians. Maybe I'm wrong, but he said something like "Iran is showing it can shoot a high-tech F-15, and hopes this is a turning point in the war" (paraphrase).
I really, really hope they find the second crewmember alive, but militarily, I don't think shooting down an F-15E wins the war for Iran. It is a PR victory for the Iranians. The Iraqis shot down something in the neighborhood of 40 coalition aircraft in Desert Storm, and they still lost decisively.