even if it speeds up by a factor of 10.
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And if it speeds up by a factor of a few thousand?
Doesn't matter. As someone who lives in a "bottom" I can state with absolute, 100% certainty that, frozen or thawed, $#!+ flows downhill...always has...always will.
Whether it's a pipeline, railroad or a road, following along the banks of rivers and streams in mountainous terrain is the easiest, cheapest and fastest way to build. The longevity of the product of those economies however, is another story.
If it speeds up by a factor of a few thousand, it’ll all be past the road, they can rebuild the road and the issue is done.