Speculation intensified this week that NBC will move to install Fallon as the new host of The Tonight Show within the next 18 months.
NBC has thus far denied it has any plans for Leno to end his second run as host of The Tonight Show, despite highly-placed sources insisting that a transition is in the works.
Leno's late-night rival Kimmel weighed in on the potential shake-up at NBC in an interview with CNN earlier in the week.
"God, I hope [they replace Leno]," Kimmel declared, but quickly clarified: "I really - I don't know. I mean, I have no idea."
The Jimmy Kimmel Live host went on to suggest that it would make perfect sense for NBC to move Fallon into The Tonight Show, given his growing popularity.
"I mean, well, obviously, NBC is looking to move on, because they did it once already," Kimmel explained. "This would be the second time that this has happened. So I mean, it makes perfect sense."
He continued: "Jimmy Fallon is doing a great job. And he's very popular. And so, I mean, hey, eventually, it's going to happen one way or the other.
"I mean, one way or the other, it's going to have to happen, right?"
Kimmel has been publicly critical of Leno since The Tonight Show host struck a deal with NBC to return to the series following Conan O'Brien's unsuccessful six-month run on the chatshow.
The Jimmy Kimmel Live presenter famously guest starred on one of Leno's short-lived primetime series to humorously accuse him of stealing The Tonight Show back from O'Brien.
He more recently charged that Leno sold out his artistic credibility to appeal to a larger audience on The Tonight Show.