That's a point. Yannis has said Foals are planning to go start writing next year, and has solo shows with The Yaw in December, while Kele is doing a solo tour in February.
Think other comparable acts are selling at these sort of prices for the arenas tbf.
His Newcastle stadium shows were about 1hr45-50, which is about the length Muse do at their stadium dates tbf.
Whether selling out a stadium in LA translates to selling out a UK stadium in the case of Fred Again is another matter. I think he's super popular and it would need them to book, say, a Tottenham stadium show to truly know.
Fender has also done Finsbury Park, which at 40-50k is about the size of a stadium show tbf. Even if many people still see Sam doing two nights at the NUFC stadium with a crowd that treated it almost like it was a Newcastle game.