Here's the kicker- With a population that has been so entirely conditioned with constant out-of-control spending and deficits, thus its subsequent devaluation of the home currency, any deviation in a deflationary spiral would have very deep and profound implications. The nation, as many other nations the same in this world, is not prepared for a period of falling prices. A complete collapse in real estate and other areas would be a foreign anomaly to the general populace at this point in time and that is most likely why it will come to pass. Can you imagine if the DOP went back to 18 to 1 USD? Many of the so called wealthy in the nation would be decimated as costs of debts on their books soars. The use of debt in DR is pervasive and their are real risks when savings has been thrown out the window with the bath water.
As many are awaiting, myself included, the peso to go to 100 you present a very plausible possibility and highly likely scenario since no one expects it. Economics is as much social as it is mechanical. The fact that we expect the peso to go to 100 may work against us since the expectation will mold the expected event therefore nullifying its future reality.
If most expect it, it may very well never occur. The reason being defined by a Spanish saying, "guerra avisado no mata soldado." If most felt such an occurrence as an absolute reality, positions would be taken that would negate the peso from going to 100. In essence, the opposite may occur because in a panicked frenzy during a crisis event, peso holders may want out at all costs. The central bank would intervene destroying pesos digitally to maintain certain levels.
The peso could very well strengthen in that reckless manner you state going to 20 to 1 and that would definitely bankrupt the nation just as well. The peso has been inflated for over 30 years in order to maintain a semblance of order even if it has been an orderly decline. The devaluation of the peso has covered up the reality of a non-productive economy for 3 decades. It has enabled fiscal mismanagement, economic distortions and an IMF created macro-economic "stability" which isn't true stability at all.
Now, given all of this, the historical track record of the peso has been one of constant devaluation to the point of a peso at 40 equaling 2.5 cents. That's a 98.5% loss of its value versus the dollar. The ZERO point is very near and before the peso hits ZERO, a runaway locomotive effect will take place with the peso moving at wild gyrations. At a nearer ZERO point, the peso could unravel like the Ecuadoran sucre reaching the many thousands to die an ignoble death like the sucre at 25,000 to 1.