Went back for a second dose, this time at the Hard Rock Casino in Atlantic City. They are missing a Brother, as Tom Johnston is apparently still recovering from surgery, but this was a bigger venue than in July, so they ended up playing what felt like a more expansive and longer set. Legends.
I saw an interview with the Doobies from about a year ago where they were openly talking about going to Europe and Australia, but that does not seem to be materializing yet. By the same token, they seem to have no intention of hanging it up any time soon, so you never know.