system
Given the following post, respond as if you're commenting on Reddit:
human
[Skyrim] Why am I the "Last" Dragonborn? Will there never be another?
gpt
It's a point of contention. We aren't even entirely sure how the Dragonblood works. The one source that says it's not hereditary is deeply flawed, and all the evidence that it IS hereditary is either out-of-universe or circumstantial. 

It's highly probable, however, that the Dragonborn have served their primary purpose. Stopping Alduin from turning the Kalpa. Whether Akatosh ever finds a secondary need for them or not, they've done what they were designed to do.