Actually people thought that, but here's the thing. In our recent election, even if every single person that voted for these third parties, Harris still would have lost. That's how big the margin was for Trump's win.
So there is no splitting the vote on the left. They did so badly, that nothing would have made up for it.
If they use this loss as a learning experience, revamp the party, start doing what people actually want and need them to do, then people won't feel the need to go to another party.
I love Lucy Lawless, personally. Well at least the Xena, Princess Warrior version of her anyway.