Even Barry Goldwater, who you cite as authority, disagrees with you. Recommend you take a second look at his words you offer here for your "we are screwed" perspective:
"They reflect the view of a majority of the leaders of one of our parties, and of a strong minority among the leaders of the other...
Yes, there are indeed two parties and it is our fault one is dominant over the other. The means to correct that condition are on the table right in front of us.
Take a look at the overwhelming number of R counties across the nation. The solution is to effectively increase activity at the local level in a way that influences action at the federal level. That, of course, requires some "stand up" level of guts.
Thinking there is a single uniparty only supports the "why even try" view.
You can have the last word.