And then what ?
You might wind up with several parties, ranging the ideological spectrum, acting more like a mob if not disorganized rabble, which will eventually (sooner than later) be manipulated and coerced back into two or three parties, to be later refined back into two parties.
I suggested you study the American history of past 300 years and also the nature and trend of the two existing political parties and what is involved in running a campaign and getting elected.
Our current "two parties" reflect the polarity of ideology and political thought and methods for getting things done without use of violence towards a one-party rule system.