Great thread.
I was starting to lose faith in my fellow pilots. This same discussion happens over on our B6 Bich Board and it seems like a large number of guys don't see a problem with the erosion of both CA's authority and the respect/etiquette of the whole jumpseat privilege. I'm glad to see that most outside of our company understand that it is a privilege and should be treated as such. Surely the lapse has more to do with a no Captains' authority culture at B6 than an industry wide problem. Also guys with no prior 121 experience seem to have a tough time differentiating between non rev and JS travel. Hopefully it is a problem we can fix internally.
That being said, as an FO, I often saw legacy guys showing up using their JS privilege to travel in sneakers and jeans. Granted the CA should have corrected it, I find it hard to believe that the legacies (where I assume CA authority takes precedence over Kumbaya culture) aren't better educated on JS etiquette.