A rash assumption..."we now have the final revelation of God in the Bible."
No, it isn't an assumption.
2Ti 3:16-17
(16) Every scripture inspired of God is also profitable for teaching, for reproof, for correction, for instruction which is in righteousness.
(17) That the man of God may be complete, furnished completely unto every good work.
If "the man of God may be complete, furnished completely unto every good work" by using Scripture, then I would say that no other revelation of God would be needed.