I don't see a problem with this off hand, but only time will tell. Luckily this is an indy game, an little is written in stone as the game grows and evolves.

The way they have it now, more tribes will be encouraged to expand outward as the mist is expanded so they can get larger plots of land. This will also free up land over time near the lake for those people who MUST be on the lake. I personally see more excitement coming out of the mist than the lake.