I'd say NO, but there's no right or wrong answer here, because there's not a explicit definition of what is considered to be a nostalgia act.

First, I'm pretty sure when Jon said it, he meant nostalgia as a forgotten greatest hits band, whose only fans are those from 80s, a band that actually tries to look like back in their heyday, that hasn't had a new song on the radio in the last 20 years, plays the same 'greatest hits' setlist for 10 years, and has members participating in those pathetic celebrity rehab reality shows, etc. You get my point. Plenty of examples, Guns N' Roses, Kiss, Motley Crue, Whitesnake, Journey, Poison, Cinderella, etc. Even Def Leppard, a good band, off course, but when I saw them alive, I didn't want to hear any songs that were released later than '95 and I'm no 80s kid or even a big fan of the 80s era. Bon Jovi is not one of those bands.

Second, we're talking about a band that still sells out big venues (or sells majority of tickets if they play big stadiums). How many other bands are still that big in 2013? I think I have more fingers on my both hands. We're talking about a band whose newest album went number 1 in US, Australia; no.2 in UK. With album sales being on a steep decline, total sales is not a good indication. Every veteran artists sells less and less with every record, obviously. But chart positions show their actual popularity in comparison with other artists, not in comparison with previous albums. These are not chart position of a nostalgia act.

Thirdly, an argument I have heard several times is "people don't go to Jovi shows to hear new songs". Yes, that's true. However, when people go to see Bruce Springsteen (who is a 'good example' in pretty much every Jovi-related discussion), do they pay to hear stuff off Wrecking Ball and Working On A Dream? No, they wanna hear stuff in the rage from Born To Run until Born In The USA. Do average U2 fans go to hear songs fron No Line On The Horizon. Off course not. Are they nostalgia acts as well? If yes, then which artist that has been in this business as long as Bon Jovi is NOT a nostalgia act. 50 year olds just don't gave number 1 singles. Rock bands don't have number 1 singles anymore. So if every old artist is a nostalgia act, does this label makes any sense? Are Linkin Park or Nickelback nostalgia acts as well? I really doubt people pay to hear stuff of their new albums.

I'm not arguing the quality of later releases, because for me that is not relevant to how I understand what is a nostalgia act. If one can come up with a definition of it we all could agree upon, it would make it a lot easier.

EDIT: God damn it, I wrote my response for too long and some people have made the same points. I should have seen this thread later, would have saved some of my time, oh well. Great post crashed!