As long as they don't try to pull some weird shenanigans like implementing a caucus for California and putting all of the meeting places in Mendocino County, I'm fine with this. Parties should be run by their grassroots elements (as long as they know what they're doing) so you don't have a situation of an clear victory being marred by charges of illegitimacy like DWS so kindly gave us last year.
If the party replaces the primary with a caucus, my relatives who are mostly Democrats (who voted for Hillary Clinton; many who live in very conservative neighborhoods like I do) would never turn out, and they almost always turn out for primaries. Do you think the state's party will actually replace the primary with a caucus?