Dollarization is such a complex topic/mechanism that I don't think there's any one right answer to whether it's effective or not since it depends on a particular nations circumstances. I heard a story on a TED talk about how it didn't work out (from the perspective of merchants) as expected in Lebanon. I've heard ups/downs from people in Ecuador.
From what I understand everything here is based on Benjamins ($100 bills). I wonder how they're going to acquire the necessary amount of 50/20/10/5/1's and would they even bother with half-dollars, quarters, dimes, nickels, and pennies?
Is everything, even the smallest of purchases, going to be rounded up to the nearest dollar like what happens in Ecuador? That 200 peso candy bar in the supermarket - are you going to be forced to buy 4 or 5 (or whatever it would be depending on if the official rate or dollar blu is used) for a dollar, or is something that currently costs the equivalent of around a quarter now going to cost a full dollar? Penny candy/caramelitos? No more buying 1 or 3 for the equivalent of a small fraction of a dollar, you're now going to have to buy a dollar's worth? Do things currently priced just under the equivalent of a dollar (say a beer) get bumped up to just over a dollar by merchants looking to double their revenue by someone buying just one beer?
Are they going to consider the physical bills the way they do the peso? Will US currency be accepted with folds, creases, tears, tape, writing, etc., like they do with pesos, or will they only accept currency in pristine condition? If so, not only would they have to acquire all those bills in smaller currencies commonly used, but they'd have to be (and be kept in) in pristine condition for them to hold value. What other potential restrictions would they create?
And if there's one thing that probably unites the majority of people it's the belief that government is at best some degree of incompetent and inefficient - and these are the people who are going to be carrying out such a massive project as dollarization. Does anyone think they're going to do a great job at it and that this will somehow happen smoothly, efficiently, and with minimal problems?
My guess is no matter who wins, no matter if they dollarize or not, they, whoever it is, is going to f' it up big time.