Firstly there is no evidence whatsoever that Yekuno Amlak was related to the kings of Axum. Neither the Kings of Axum nor Yekuno Amlak ever claimed descent from Solomon
Secondly, even if the lineage was true Emperor Naโod (Who ever other emperor claimed descent) from was a Bastard. So the line died out with Emperor Baeda Maryam
Secondly, even if the lineage was true Emperor Naโod (Who ever other emperor claimed descent) from was a Bastard. So the line died out with Emperor Baeda Maryam