If there is a 2020 tour, I don't see it being backed by new material. The guy has like 3 or 4 soundtracks he's working on now. Every week we seem to get an announcement of a new project he's working on.
I have a feeling Nails is not on his priority list at this moment in time.

If there is a tour, It'll probably be a 30th anniversary tour of some sort to celebrate 30 years. Maybe Hate 2020? I'm still holding out for PHM 30th anniversary surprise pop-up show in October, but I know deep down it ain't gonna happen. Still... he has to acknowledge PHM 30th anniversary in some capacity this fall, right??? He acknowledged Woodstock 25th after all... Maybe we'll get another t-shirt lol.
Coming up 20 yrs on the Fragile in a couple weeks too....