Late into this topic, and certainly didn't read through all 29 pages of it, but here's my little weigh-in.
First, the "silent protagonist" thing is not dead. At best it's slumbering, but it's most likely the way of the future for RPGs. Keep in mind that most such protagonists are not silent - they are you. They are what you put into them. And as technology improves to better allow us to put more into them, RPGs will open up more to allow more for this, and less for defined protagonists.
That aside, protagonists are an all-or-nothing ordeal. Either you have to make them silent, and allow the player to form them completely (which isn't very cinematic at the moment, which is all the rage) or you give them a voice, in which you're already defining them. Bioware's greatest mistake in their modern titles is believing they can create blank slate voiced protagonists, but this simply does not work. Even Hawke and Shepard they attempted this with and, frankly, they too are not all that great of characters. Shepard got away with this somewhat due to fantastic voice work, and Hawke could be alright if you stuck down a single dialogue path, but in general it's just not the most efficient way to go with such characters.
So let's talk about future then. Bioware won't be creating a silent protagonist in the forseeable future. That's obvious. Thus they shouldn't be holding back with the protagonist anymore. Make them a character in their own right, one with a defined personality, history, motivation, yet one we can influence. For example, not having a character who is sarcastic, or mean, or nice in any given choice, but has one solid personality which we influence the choices of. Thus we'd have a character that can be sarcastic while doing good, or bad, or just for the hell of it. This'd create a more consistent, cinematic and, in the end, memorable character.