Britney would need to bring serious A game because if she is confirmed to headline, a bad performance will ruin her career, especially in the states
She would need to like cancel Vegas and use all these months leading up to it rehearsing, because it would be a deal breaker, people would either be like "OH WOW BRITNEYS BACK AND SHES BETTER THAN EVER OMFG"
Or it will be "what a train wreck retire please that was dreadful"