Lesson learned for you, yes, but look around you though at the huge mass of Democrats still supporting Obama, even people who previously marched in anti-war protests during the Bush era. Most of the time, for most of the people, the lesson is not learned at all. Has Romney's nomination just four years after Bush left office not proven this? We've already won over about as many of the rational people as we're going to, and we're coming up against diminishing returns there, because most people have entirely different personality types. Now, we're stuck trying to win over the vast majority of people who form their political opinions emotionally based on social cues. In the case of Republicans, a Romney win will not bring them closer to us; instead, it will embolden them to pursue Bush-era policies with renewed fervor and arrogance and fewer doubts. Combined with all of the other consequences the OP listed (such as our next chance at the Presidency being 2020 at the earliest...a huge problem), a Romney win is the absolute worst case possible result from this election.
Have you read the free Ebook "the Authoritarians"? (I just did, and if you read it it will confirm a lot of what you're saying. Great book! Really.)
I guess I just think the internet is a game changer. There are still a LOT of Obamabots, for sure, but I think people might be wising up. Over at my.Firedoglake, (and firedoglake is the second biggest liberal blog on the web, second only to Daily Kos!) NONE of the community are still supporting the Dems.
And a LOT of RP supporters were rooting for Bush before he was elected. I think the internet changed that in a smallish but highly significant way, and in a way that's growing.