On a similar front, I attended Mass with my grandpa, and his Church is now mostly Spanish speaking, or bilingual. That's good for the church, as it needs young people, but is a bit sad. He grew up in that Church, and even if they never had homily in German, I imagine plenty of the people there spoke that way. It was exceptionally common when he was young, at least for that region, or perhaps extended family. It's difficult to know for sure, or understand everything he says now that he is so old. Or more pointedly, because his health has been so poor for such a length of time.
There are 2-3 old school delicatessens here in town run by German or German-Polish families. All of the owners and old staff either know my grandfather personally or know about his family. I mean we do have a street that runs through the middle of town with our name on it
It will be interesting to see if they know any speakers closer to middle age, or possibly even my peers. I do admit I would prefer to work with someone who was within fifteen years or so of my age, or we probably won't have much to talk about 
I'll give some updates if I have any.