Not sure if this has been mentioned, but Fallon is under contract with The Tonight Show until 2021.
NBC Extends Jimmy Fallon’s ‘Tonight Show’ Deal Through 2021 | Variety
So to counter the arguments that Fallon might not be relevant in the future, he'll be at the helm for at least 5 years after the attraction opens.
NBC Extends Jimmy Fallon’s ‘Tonight Show’ Deal Through 2021 | Variety
So to counter the arguments that Fallon might not be relevant in the future, he'll be at the helm for at least 5 years after the attraction opens.