Now that the two parties have agreed to dissolve, there isn't really any reason to oppose this.
So the new parties don't deserve any sort of legitimacy? Definitely not fair. People can have their stupid multiparty caucuses and they can also keep them off of ballots, the way any normal democracy functions. Or else why even limit caucuses? Why not five caucuses? Three caucuses certainly isn't enough.
I was mostly referring to the part about removing restrictions on caucus membership, since that was the most controversial part last time. Here's my solution, if people still have a problem with that: Allow caucuses to decide for themselves if they want to be multi-party or intra-party. Otherwise, I'm ambivalent about caucuses appearing on the ballot, with really no preference either way.