I’m pretty sure that F1 Venues are limited to 3 or 4 non-F1 races per year. The Circuit of the Americas already has Moto GP and V8 Supercars visiting as well so I’m not sure how open they are to bringing in IndyCar.
According to this article COTA did contact IndyCar to see what could be done. But I agree that the calendar is getting a bit full of Texas.
@tommyB89 at least they will be having the V8s and if they don’t manage to lose the contract with Dorna, they will have MotoGP visiting as well. Should be adding a bit of endurance racing as well, I hope.