Mirrors might be useful if only to display a dot, like the planes appear when they are at long range, just to let you know someone is back there somewhere.
With the current view system, you can look fully backward with the touch of a button, even when pulling high Gs. And all of this takes less than a second.
Mirrors allowed a pilot to see his six by just looking up/left/right a bit and I believe were the type on the right of your car.. wide angle.. objects closer than they appear.
I flew at Air Combat USA last year and you better believe that turning to look over your shoulder while pulling 4-5 Gs is no easy venture. And like I said, since there is no G effects on how fast you can switch views, who needs a mirror? You would have to take up some of your forward view to see it, and if you had it as an alternate view, you might as well just use the six view the way it is.
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"Wing up, Get kills, Be happy"
Midnight
13th TAS