Yes, America is ready for a third or even fourth party. Possibly, America is ready for a nonpartisan government. Nebraska's legislature is a great example of how it could work. They run their legislature as a unicameral (one body) and all legislators are elected in a nonpartisan system. It allows for each individual to promote their ideas in a way that expresses the greater good for the state as a whole rather than fitting into a particular party platform. It seems to work beautifully.
With only two presidential candidates running for president, the American people have very limited options when it comes to voting for their next leader. There should be more candidates running so that the people have better options. Three or more parties running give more competition and hold leaders more accountable to the people.
America needs a third party canidate and a viable third party, but Americans as a whole are very used to choosing from this or that, that they have not learned how to choose from a variety of things. Younger americans are a little more comfortable with a wide variety of choices, but they still go by their peer group.
No, America is not ready for a third party, at least not in this election. The two party system is flawed, but this election has a very clear choice. Clinton must be elected president because she has experience and will do a much better job than any of the other candidates.