The programming legend told Eurogamer that he believes Sony's new console will arrive "in a couple of years".
"The next-generation will be here soon, a couple of years," Carmack told the website.
"It'll be another ten times as powerful as this [PS3]. I'd be surprised if that doesn't last over a decade before people wind up saying, well, we've really tapped out everything you could possibly do on there.
"The better games get the harder you have to go to give a delta people care about. That's going to be a challenge for the next-generation of consoles, to show what pack-in title is going to look so much more awesome than what you get on the current ones that people want to go spend $300 on a new console.
"They'll be able to do it on the next generation, but it's going to be much harder."