Not really, Billy and Jimmy are the two most important members by far, I'd compare it to a GNR show with Axl and Slash. Jimmy is irreplaceable as a drumer, the other two not so, Billy plays most of the lead guitar in all the live videos I've seen. IIRC D'arcy couldn't even play the bass before joining the band...
I'll be there, was even thinking about flying to wellington or christchurch to see them twice! One of my biggest regrets of my teenage years is missing their show in 1996.
Besides, I thought the GnR show last year was pretty good!