The Mexican F1 Grand Prix is an amazing event. Switching it to an IndyCar race wouldn't be the same. Sponsors and fans know the difference between a Mercedes vs Ferrari duel and a Penske vs Ganassi duel.
An IndyCar race would be an addition, not a replacement to F1. However, it could be a replacement for FIA WEC.
Speaking of which, having IMSA as support series would be a nice idea, although that's a 2019 plan. Plus IndyCar would prefer an oval race, I think.
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