That sounds plausible, we know from the trailer that Kuviera's going to be leading an army attack at some point, and if it's in the finale, it makes sense for Wu to turn around and lead the counterattack, only to say ra ra pro democracy at the end. (It'd also complete the cycle, season one was communism, season two was religious extremism, season three was anarchy, and season four is fascism)
Also, for all the hate against Kuviera (which I side with), Republic City's plan could have been interpreted as using Wu as a proxy for a shadow government, not the most noble of endeavors (that Tenzin's backing it makes me think that it's more genuine though).