I went to a bluegrass concert a few years back, and John Paul Jones played with other performers. I got a pic with him. They have lives and careers outside of Zeppelin, so it's unfair to get angry at them for not touring as a band. They've given us a lot, and pretty much have the right to persue other avenues. BTW, JPJ did a rendition of Going to California on the mandolin that was absolutely incredible. It brought tears to my eyes. It sounded like a classical piece, and was hard to believe he made such music on such a tiny instrument.
That said, I always think there will come the day when I'll be tired of Zeppelin and all the old songs---it just never happens. I'm really emotionally connected to their music.
If you ever see the tribute band, Zoso, in your area, give them a try. Of course, they are not Led Zeppelin, yet the Rolling Stone wrote them up as the greatest tribute band. I've seen them quite a few times, and it's really a blast. They stay true to character and have really done their research. And they are great musicians. It's probably the closest I'll ever get to seeing them live, as Bonham died just before they were scheduled to hit my town. I was a teenager and heard the news on the radio I was allowed to play. Devastating because I never wanted their music to stop.