Absolutely disagree. Part of the criticism leveled at the Democratic Party is that it has internal disagreements - they don’t always vote the party line. That means the Republican Party as a single party would be devastating, but Democrats would only loosely keep their hold.

We’ve had far more people in recent elections wanting to vote for a third party but deciding against it because it would waste their vote. With one useless (R) party removed, that just becomes second party.