Concur. It's not quite as widespread - what I've seen is that even quite a few non-natives tend to adopt "needs washed" after living in the region for long eno

Concur. It's not quite as widespread - what I've seen is that even quite a few non-natives tend to adopt "needs washed" after living in the region for long enough, but I don't hear yinz used unconsciously from people not born in the region. But there's plenty of yinz - and the city embraces its yinz-ness.