Maybe, maybe, but the last two known DB's become gods (Reman & Hjalti), considering Thalmor's plot to undo Talos, someone should become new God.
Was Reman a DB? Anyway, I do have to say that I am a "kind of" supporter of the DB = new Talos theory, simply because I support Ulfric (*hint" signature) mainly for the reason he is the way to strengthen Talos and therefore stopping the Thalmor, but considering how TES games usually "end" I can't really believe it myself.
No TES game since Morrowind has an real ending during the game, so everything we know of the hero is told in the next game. If this continues with Skyrim, which I believe, we will never ascend to godhood during the game called Skyrim. So TES 6 (hopefully subtitled "Black Marsh") will probably include some rumors à la "did you hear about that crazy person in the north?" where it's explained that the DB did something really awsome, which the player (!) already knows, and then vanished like the Nerevarine did. Of course Beth could include DB = Talos in TES6, but it would be strange to hear rumors like "oh btw, there is this old-new god up in the north".
And let's not forget that it's still not fully clear what exactly happened to the CoC. Is he really Sheo, was he Sheo all allong or did he even exist? As soon as you deal with Sheo there is no real "truth" anymore.