User blog comment:Hielmiez/Aikatsu Friends! Next Aikatsu series?/@comment-24831376-20180103032642/@comment-3487190-20180103040436

Well... as mentioned below,  the chance is low. If it's just a subtitle they could rather keep the main original title without registration of a new franchise title.

An individual movie title? Not too sure... We had crossover stories in TV series last year,  and perhaps fans expect a whole new independent Stars movie,  if possible,  since the previous one was divided into two parts.

I can see the opinion of not wanting a reboot. Either because Stars fans would feel dissapointed, or it's a waste that there are still many other untold idol schools in the series. Sadly it all depends on BANDAI's decision since they have to take care of financial reports.