SM only has about a year of eps left. Both BW and XY ended around 142 episodes or so, and we have titles up to SM101. That means SM only has...roughly...a little over 40 eps left. Between Ash's last Kahuna battle, the league, and maybe a small team skull arc if we're lucky, there really isn't much time to flesh out the rest of the SM characters yet.
If Lillie has no major arc planned for the last year, and just stays roughly the same as she is now, her character arc is going to turn out very disappointing. It's like the writers rushed all her development into the very first year...and then besides give her one Z crystal, barely did anything with her since. She has some role in fillers like the play episode, but that doesn't really do anything for her character arc. Considering the whole Ultra Beast arc is over and Lillie had virtually no role in it, I don't even know if they have an arc planned for her in the last year of SM. It's kinda obvious none of the SM girls are going to capture a new pokemon at this point, so I have no idea what they can do with her.
If Lillie has no major arc planned for the last year, and just stays roughly the same as she is now, her character arc is going to turn out very disappointing. It's like the writers rushed all her development into the very first year...and then besides give her one Z crystal, barely did anything with her since. She has some role in fillers like the play episode, but that doesn't really do anything for her character arc. Considering the whole Ultra Beast arc is over and Lillie had virtually no role in it, I don't even know if they have an arc planned for her in the last year of SM. It's kinda obvious none of the SM girls are going to capture a new pokemon at this point, so I have no idea what they can do with her.