Toy Story 4 still made 1 billion at the boxoffice. A Cinamascore, 97 RT critics and won best animated film at the Oscars. I would take an unnecessary film with those scores over the animated crap we're getting today anytime.
So far it has an 72 on metacritic and 78 on RT. Not many reviews so far. Will probably end up in the low 60s metacritic and high 60s to low 70s on RT. Basically the same as Men. Never trust reaction from SXSW.
Did the general audience even like the first Dune? Seems like it was just fans raving about and if so there is no reason to think they would be on board for part 2.