That might be true when you increase the number of players while holding number of regions constant, but what has been done in practice is decreasing number of regions while holding player numbers constant. I don't think the latter case can logically lead to more realms.
It COULD, since again forcing density has the propensity to force internal conflict which leads to splits. But as with all things it makes assumptions, like characters being different enough to create the conflict, characters with the opportunity and power to do something actually being involved etc. However Chénier was making general statements about density, not necessarily stating that actions like the glacier to force higher density would result in more realms.
Indeed, it was more of a general statement. However, the thing with historics is that it all depends where you put the start of the data. Did increasing the density increase the number of realms on Dwilight? No, it did not. We even lost many, but let's just picture an earlier post-invasion time when the realms of the west were struggling for a foothold, because we also lost a lot of density since that. If you look at farther back, however, you'll see that the realm:density ratio of the post-invasion was the same as one found before.
I don't think I'm being very clear right now, though...
Let's look at it another way: realm numbers react more quickly to
increases of density than to decreases. While logically, one could assume that if increasing density results in splits, decreases should result in mergers. But for one, realm mergers are against the rules. Then, one must consider that people grow attached to realms, and will stick to them for far longer than they are viable.
