That is already heavy SSAA. Its realistic usage is… quite limited.
While I always prefer sharper image, result of almost all sharpening filters looks like sandpaper to me. That is a personal opinion, not a result of survey though.
I don’t understand though, why there is that much talk about sharpening and motion blur in a thread about anti-aliasing. As weird as it may sound, TAA does not introduce that much blurriness into the picture. On the contrary, it gives well-smoothed picture, that it is commonly perceived as one with lacking contrast. It is worsened by the fact, that most users grew used to over sharpened edges so much, that TAA instantly looks worse to them. Side-by-side comparison of TAA with 4x SSAA kinda confirms that. By all means, that is not a problem of TAA. Not a problem at all. Giving end-user ability to revert to his favorite AA method would never hurt though. My personal favorite is T+SMAA for almost any case for the very same reason.
Speaking of motion blur, same applies. It should be always left to end user to decide if it should be left on or off and its scale. Also motion blur barely introduces new ghosting to the image. It exaggerates exiting one, so I would not even mention its relation to TAA ghosting at all.
Temporal Anti Aliasing suffers from two underlying issues. Imprecise history clamping and erroneous velocity selection for small geometry. I think, if you are not addressing these ones, it is essentially a raindance.
Though it is good that features like r.TemporalAACurrentFrameWeight cvar are covered here. I believe good deal of engine users were unaware of its effects.