It's 20 years since they released their groundbreaking self-titled album but it's 12 years since they produced any new material, and Morello says the second fact is the one he finds most surprising.
He tells: "If it were up to me I would have made two records a year. As it is we have just three records of original material.
"Whether or not we play again in any capacity is unknown. Every show we've ever played might have been the last.
"Once a year, the band meets and very seriously discusses and turns down awesome offers to tour the world. That's part of the program."
Yet Morello remains proud of what RATM have achieved, and grateful his band mated agreed to release their anniversary box set, which includes a DVD of their 2010 concert in Finsbury Park to celebrate their victory over TV gameshow X-Factor in the 2009 Christmas Number One race.
"It was my great hope that we'd celebrate the 20th anniversary with a five-continent world tour," he says. "But short of that, this box set is something that will hopefully be very satisfying for longtime fans, as well as turn on new fans to what the band is all about."
The band has always been about taking a political stance something Morello feels was missed by many of the acts they influenced, ClassicRockMagazine reports.
He reflects: "When Rage finally did break, and sort of created a genre of music, the audience that we created was then served by bands that may have had some of the sonic ingredients, but completely lacked the politics.
"You'd think that in the wake of Rage's success, in the course of the last 20 years, there would be other examples of bands that were able to fuse genres with political content. And there havent been any. I think that speaks to the very, very unique musical and personal chemistry of the four guys in Rage Against the Machine."