It should be 9-0 on this dumb challenge. I'll say 6-3.
No it should be 8-1. The reasoning of the plaintiffs is just the sort to appeal to Thomas' limited comprehension.
While technically there is not a circuit split, that's only because the ruling against in the DC Circuit was referred to an en banc review. The argument that this should ideally be resolved quickly is not unreasonable and may have led to some justices who are in favor of allowing the subsidies to continue to push for the case to be heard rather than leaving the question dangling.