JD @ Pachyderm here. We try to talk to as many people as possible about their data infrastructure so I have a decent sample size on this. My experience is that there a specific use cases for which streaming solutions are gaining ground but there's still a lot for which it isn't and probably never will. Streaming is great but there are a lot of situations where it just doesn't fit. I think what might be going on is that there isn't a lot of chatter surrounding batch based processing so it seems like it's going out of style but the use cases are still real