I just reread the concurring opinions of Justices Roberts and Scalia - neither differed in opinion with Kennedy's majority opinion. Rather, Roberts wrote to say why Stare Decisis did not apply, and Scalia wrote to counter the arguments of the dissent. Thomas and Alito joined with the majority opinion without comment. It's likely that at least those three would consider corporations as people and side with Disney here. So you would then need two of Kavanaugh and Barrett to go along, to say nothing of the three progressive judges who may also go along because of the principle of precident.
The 5-4 decision in Citizens overturned precedent in Austin v Michigan (1990) and McConnell v FEC (2003).
The only remaining justice on the Court who dissented from the majority is Justice Sotomayor. Interesting to consider how she would rule in this instance, given her dessent in 2010.