Although many would love to see Dr. Paul run 3rd party, at this point there [REDIRECT]are[/REDIRECT] is only [REDIRECT]2[/REDIRECT] 1 logical reasons I can see why he would do so:
2) Dr. Paul truly believes that the political/economic situation in America is so dire that he must do even more than he has done to address the issue
First, I don't think that Dr. Paul would run as a third party out of spite or revenge, because he has already refused to endorse Romney and he must have expected at least this much resistance by the powers that be. So that eliminates reason #1.
As for point #2, it is evident in his speeches, campaign rhetoric, books, etc. that Dr. Paul believes America is truly on the wrong course. But what would have changed between mid-summer and now that would make him change his mind to run 3rd party? If he really believes that America does not have 4 more years to try to turn things around, then he would have gone 3rd party a long time ago rather than this plan to "take over" the Republican party. I just don't see what could have changed last week that would make Dr. Paul change his strategy. I would love to have seen Dr. Paul become president but barring a miracle, with all the power in the hands of the Democrats and Republicans it is very likely that it will be Obama or Romney, and a 3rd party run would just be a wake-up campaign for Americans. And that's assuming he gets in the debates, which he won't, so the message won't really get played out much more than it did during the Republican primaries where at least the media had some interest in printing his talking points.
So as much as I would love to see a 3rd party run from a "stick it to the Republican bigwigs" standpoint, it doesn't make sense at all for Dr. Paul to run.