Nothing would do more to help resolve the Florida and Michigan issue than for Clinton to drop out and endorse Obama.
For Clinton supporters (like me) the issue isn't whether the two states will have nominal delegates seated at the convention, it's whether those delegates, and the millions of voters they represent, are actually meaningful in any way.
Florida and Michigan are two very large states that would have probably gone strongly in Clinton's favor, changing the delegate math early on, shaping conversations and perceptions, blunting or feeding momentum, etc. Of course, it's a fool's errand to try to figure out what would have happened in the abstract sense, and the vast majority of Clinton supporters (also like me) are quite willing to concede the nomination to Obama. But what Yglesias and others seem to be saying is that they're perfectly fine representing Florida and Michigan, as long as they have absolutely no importance or impact whatsoever to the race, don't change the numbers at all, that they are completely ignored in any conversation where it isn't convenient, and that it won't change their personally desired outcome in any way, shape, or form.