The end of this movie simply confirms its beginning. The point is more toward irony than satire, as Charlie Kaufman creates his Adaptation by breaking every single rule of good writing and then giving the movie a completely hack ending, which works nicely.
The appeal of the movie is in its exposition of the tortuous process of creative writing. By demonstrating all the mistakes and hack devices, Kaufman creates a snake eating its own tale.
What Jorge Luis Borges does with the short story, Kaufman does with a movie.