Of course, they keep mentioning that the TVD and TO stories could potentially continue through spinoffs. But as someone who heard that when Buffy/Angel ended only to not see any spinoffs these 13 years later, I won't necessarily hold my breath. Although, in this case, things could all depend one how well teenage Hope goes over...
Well, this may already be further along than any potential BtVS spinoff got:
Originals Spinoff: CW Boss Confirms Hope-Centric 'Conversations'