Zak: amusing, but flawed...
You are assuming that the backlash will pull in a certain preferred direction, but consider the scenario.
For a simple reference, consider the Libertarian political diamond thingy:
http://www.theadvocates.org/quiz.html Just hit "Score It!" to bring up the map.
Suppose the Fascists get (stay) in power, and pull the country south towards the Authoritarian end, but on the Conservative side. Eventually, enough people will get annoyed and will vote/act in another direction. Under the natural scheme, the alternative is the Commies.
When the Commies come into power, they will see a powerful executive branch, and they will want to work towards their Commie Paradise. "Ah, but now
we are in power," the Commies say. "We aren't evil! We are for happiness and egalitarianism and food and shelter and work for everyone!" Since they are not evil in their own eyes, and they have the tools of the Fascist regime, they will
use -- not dismantle -- that power for their own ends. Hence, we will have a Commie regime using the tools of a Fascist regime, which will try to work towards the "Liberal" side of the diamond. Since the path is roughly continuous over time, this will drag us straight through the total Authoritarian state.
In the mean time, the Fascists will regain some of their lost power, and there will be an oscillation between the two evils, averaging out to a complete Authoritarian state, until the next major world/historic event disrupts the cycle.