IT: Chapter 2 is aiming to hit theaters in September 2019, and the story will reportedly focus on the members of The Losers Club as they grow up and return to Derry, Maine to face off against Pennywise 27 years after the events of the original.
Even with older (and possibly more established) actors playing these characters, they will still fundamentally need to feel like the same Losers that we came to empathize with during the events of the original IT.
Based on the sheer amount of character development packed into the events of the first IT, it seems reasonable to assume that this could continue as the franchise moves forward.