The title to one of Kant's most famous books is "Prolegomena to Any Future Metaphysics That Will Be Able to Present Itself as a Science", where he presents the outlines of his metaphysical theory further explained in Kant's Critiques.
I wondered a very simple question, did Kant considered it possible that another metaphysical theory be represented that he would consider "able to present itself as a science", or was it simply a better looking title than "Prolegomena to My Metaphysics That Presents Itself as a Science"? (or, maybe it's simply a translation "mistake"?)
I would like to note the importance of the question though, at least for me. If Kant indeed considered it possible that another metaphysical theory may present itself as science, it would mean that Kant treated his Transcendental Deduction as a possibility, rather than a final, finished, complete conception of metaphysics. Which would also separate Kant even further from Hegel on this topic, and bring him closer to Schelling. I guess there are other, probably more significant implications.