End of House Targaryen?

In the show, they’ve made it pretty clear that House Targaryen has ended. With Daenerys’ death and Jon Snow’s banishment to the wall, House Targaryen has been disabled and destroyed. In the books, however, it’s pretty clear that another Aegon exists somewhere (not Jon Snow). Do you think he’ll play a major role in up-keeping the Targaryen lineage or will GRRM kill off the house in Dream of Spring along with Aegon and Daenerys?