Sukuna does die in the manga. The way it happens is quite dramatic and ties in with many other elements of the story, adding depth and tension to the overall narrative.
Another possibility is that it could be an older, forgotten character from the Naruto universe. Someone who was once on the sidelines but now has a new role as the chosen vessel. It could be a character from a minor clan that has some long - lost power that makes them suitable for this important position.
No. Ryomen Sukuna is a fictional character from Japanese mythology and modern manga/anime. He doesn't have a basis in a true historical event or person.
Nope. Ryomen Sukuna has no basis in reality. It's a product of the creative minds of the writers and illustrators who designed a captivating fictional character for the enjoyment of the audience.