Democratic and Republican Parties collapse like the Whigs in 2006

[Colin]

I'd like to see a multiparty America.

Same here but it wont happen unless we either A) do away with First Past the Post Voting or add a run-off B) become a parliamentary system or C) get Proportional Representation in either one or both houses of Congress. Otherwise it would be very hard for America to evolve into a semi-three party state, like Britain, and near impossible to have a viable three party system or multi-party system.

[Colin]

Would any state parties such as the Independence Party of Minnesota

The IP would flourish.  Maybe they'd be the beginnings of a national centrist party?

In a non-parliamentary FPTP system a centrist party wouldn't work even if they were a coherent enough organization. They would constantly be pulled on either side by the large right and the left.