1) it doesn't need to be smooth. Fallout 3, and new vegas, werent, 4 wasn't, skyrim wasn't.
2) you already CAN have 3rd person by going into the game files and changing them, and so far the consensus by those who have done so is that while yes, it is a little janky, most of that is because you had to go into the game files to do it.
3) it really isn't much more than an on/off toggle, and no one is expecting for it to be added overnight, nor is anyone expecting it to be perfect, only for it to exist.
Having third person doesn't require a huge overhaul in how the game works, or the level design is, as shown in the fact that it's in there. Not having it doesn't add anything, it exclusively takes things away. Also again, the point of neither my previous comment or (I would assume) the post in general, is not to say 'game sux, gib thrd person or else', it's to point out that as great as the game is, third person is something we want, and adding it now (meaning post release now, not right this second now) would only bring more people in to play the game.
Why not let people play the way they want to?