I'm THE world's biggest Zeppelin fan, but I'm not sure about this. It's like he said it to appease people. If you've ever met Robert, he's that kind of guy...he'll stop a cell phone call while walking down the street if a fan wants to talk to him. That "the fans look at you as the bad guy" line from the reporter might have prompted his "I'm not busy in 2014" response.
Zeppelin was something powered by youth and the culture of the time. The singer always has the hardest part of the job because your voice changes as you get older. While Plant can still sing like no other, it looked like he had to give it everything he had at the O2 Reunion. I fear he'd blow his voice out if he had to do a show like that dozens of times on a tour.
On the other hand, I would LOVE a new album. Jimmy Page has had new material he's been sitting on for 3 years now. He just needs someone to record it with.