Yes there are shinobi that run the distanceIt was Kabuto in his Sage Mode. If he physically dodged Susanno's arrows then he's obviously extremely fast... Even Kakashi said the only thing he could do was Kamui the arrow away because it was so fast, and we all know Kakashi is no sluggish shinobi. Not to mention this was before Sasuke mastered his Susanno.
The TBB is referred to as "unavoidable" because even if it missed you you'll still get caught in it's blast radius. The TBB are powerful enough to destroy mountains:
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Are you trying to imply that people can run the length of an entire mountain in mere seconds to avoid this technique's blast radius? Not even Naruto characters can do that except for the obvious exceptions. Even if the TBB missed you by 100 meters you'll still be dead.
Unless it's people who have the level of speed necessary to dodge it completely, or have unique techniques that can divert it away, there's not much you can do against a TBB coming right at you. Even Gai and Kakashi would have died facing it if it weren't for KM Naruto.
You can fly evading it or a body flicker can evade it with ease
Kakashi not dodging the arrow was mere plot
Or he was just tired
That shouldnt be the only feat you go on for the arrow
Cause chances are we will see someone slower than Kakashi like Kabuto evade it
His SM may give him power ups but it was never stated speed was 1 of them