So long as the Dev team is patient with it (I'm assuming so, since it is a moving glacier). I've already emigrated 1 noble, and I'm sure there will others shuffling about until noble density stabilizes after regions freeze. If the western side of Dwilight is cleared, it could take quite some time.
Yeah; we're hoping that at least a significant number of nobles from Western Dwilight move to Eastern Dwilight. In general, though, as long as a large proportion of players don't leave the game, even with some redistribution the reduction in regions should significantly increase the noble density in the remainder of the regions.
And yes, glaciers move slowly. No worries about it gliding along at a rate of a region per turn or something like that
