They're making a (strong) comeback (although sauerkraut is still seen as "ethnic" in the anglosphere), sure

How often have you made them yourself, how often does your friend at work make them (if ever?)

Edit: I'm sure you can add to https://news.ycombinator.com/item?id=46733306

Pickles are in McDonald's burgers which is probably as mainstream across the globe as you can get.