There won't be another GT, Toei isn't one individual, it's a company that changed with time, the Toei that made the manga adaptations to the screen and the non canon DB and DBZ movies and tv specials, wasn't the same Toei that made GT, the Toei that made Super isn't the same either and even with filler, this Toei is not interested in creating another dumpster fire like the one that GT was.
Have you ever stopped to think about why nothing was made after GT?
I mean, the manga ended but that didn't stopped Toei, then why didn't they continue? DB was popular enough and Toei likes money, why didn't they carry on?
What killed DB?