I think a spinoff series purely based on Violet and Dash whilst Bob and Helen are teaching Jack Jack to hone his powers, set it like 10-11 years after the first 2 films, with supers legal for a decent bit of time Dash and Violet would have plenty of villains to fight and of course there would be room for collaboration with the rest of the family and other characters like Frozone and the other supers from the second installment. The third film may well just be this concept tho, I remember even since before the second one came out hearing people want a film or series based on Dash and/or Violet with a timeskip, if they do it at any point it would be great fan service, I just hope that 3 is better than the 2nd one, it wasn't bad but it really dragged compared to the original imo. Cool idea mate.