Not that this has anything to do with the current generation, but Guns and Roses was NOT bigger than Metallica back in their heyday. In 1993, they co-headlined a tour which has it's own stories of disaster. But I personally went to see them on this tour at the Rose Bowl in Pasadena. During that tour, the bands would flip-flop position every night as to who would play first. But they would both play a 90 minute set.
On this particular night, G&R had the last spot. So Motorhead was opening with a 45 minute set (awesome as always), and then Metallica came on and KILLED it for 90 minutes. This is after James burned his hand badly in a previous show, so he only sang and the Helloween guitarist played as a fill in musician. Guns and Roses went on after Metallica and I kid you not, at least a third of the Rose Bowl left the show in the first 3 songs. My friends and I made it maybe 5 songs in before we walked out as well. The Rose Bowl holds somewhere around 100,000 people for a concert. When 30k - 40k people walk out of a concert, that tells you something.
Guns and Roses just could not follow Metallica. After the amount of energy that Motorhead, and then Metallica pumped into the crowd, it was all lost as soon as G&R hit the stage. Now, I love Slash and loved G&R back then as well, but those 2 bands are no where near the same caliber live and G&R should never have shared a stage with Metallica. Metallica made them look and sound second rate.
All that being said, I am looking forward to seeing what JJP does with the G&R pin. I would play it and probably love it, but due to a lack of space, will never own it as I won't give up any of my current pins for it. That goes for most other pins as well. If I had the room, there are probably 20 must-have pins for me that I would love to own. But my small space for pins limits me luckily... lol. Otherwise I would be broke!