Let's face it. It's probably never going to happen BUT

[SInNYC]

Democrats didnt disband despite losing all but the post-Watergate election between 1968 and 1988 (and mostly in landslides). They also had no real chance of victory with a solid south and west against them.

Republicans didnt disband despite winning only one (+reelection) between 1932 and 1964. And that one was somebody  both parties recruited for the nomination.

So, I'd agree with what precedes the BUT in the foreseeable future.