Despite visible empty seats during weekday games, FIFA says they have surpassed 1.5 million Club World Cup ticket sold.

There's no reason to think that attendance at the Club World Cup means anything for 2026. If anything, the two might be inversely related; given the get-in prices for CWC games, it's reasonable to think that fans would want to keep their powder dry and save their big expense for next year, when they can watch the games that actually matter.