Well, people seem to think that the DLC characters were already decided during the original project plan which, if true, would probably mean ATs as DLC aren't happening. By no means would I consider that a certain thing at this stage, though.
If ATs and Spirits aren't going to be DLC, what first party does that even leave, really, besides maybe Bandana Dee or Elma? That would mean most of the DLC will be third party characters once again, which, ehhhh. I might buy one or two if I'm particularly interested, like Banjo, but I'll probably skip the Pass. I only bothered purchasing Mewtwo and Ryu last time.
Even if I'm feeling pessimistic about Ashley DLC this time, I'll try to come back and support next time around if I'm not feeling too old and boring by that point. It's a shame it didn't happen this time, though. The timing would have been great for Ashley if the newcomer choices were more in line with Smash 4, but Ultimate's priorities weren't well suited for her. All we can do is keep supporting Ashley and WarioWare to keep her and her series relevant next generation.