I haven't read this thread, but this is my spin (as an Obama supporter):
-the MI & FL primaries that already occured are tainted. All the candidates (but Hillary)stayed out and honored their pledges to the national DNC not to campaign there. Technically Hillary may have complied with her pledge, but even so, she certainly stretched the line a great deal.
-the MI & FL primaries were tainted because they occured when people were told they wouldn't count. Lots of voters probably stayed home, many others may have cast protest votes.
-the people of MI & FL are entitled to participate in the Dem candidate selection process, they shouldn't be shut out of the convention.
-all "compromise" plans I've heard so far (such as split the delegates 50/50, or Hillary's idea to seat them as selected in the defective primaries) are either BS or patently unfair.
-Odds are, that even after the PA primary, the Dem party and the country is going to need a tie breaker unless the Dem Party relies on the totally unsatisfactory "super delegate" solution. If they do this, they might as well change the name of the party for truth in advertising purposes. Personally I think NAFTA is taking the blame for economic disruption caused by other policies (nonexistent antitrust regulation, tax code promoting relocation to lower wage areas/out of country, etc).
-MI will spotlight the economic issues. Hillary will love this as she can spin her phony renegotiate NAFTA line again, but really it is good for the party and the country to have this issue front and center.
The only realistic situation I see, and one that will comply with DNC rules, is for MI & FL to have do-overs. I highly doubt the cost estimates I've seen floated around-they seem absurdly high ($30M, where most of the staff is volunteer or nominal pay, and the voting premises are free), but if the states are willing to cough up the $ (after all, it was their intentional decision to violate the DNC rules in the first place) I can see asking the Hillary and Obama campaigns for a 50/50 contribution. I'm sure we all wouldn't mind giving up a TV ad or twelve.