Just thinking, as a general statement, the more accurate Google Earth is, the more people might be motivated to model. For example, higher resolution topographical data; more recent, and clearer, satellite imagery (especially "parallel projected" or high altitude imagery). Also better Street View images-- the clearer the better. I find myself avoiding modeling in areas where there may be an upgrade anyway. The more tools (and better tools) we have to model, the more it makes it worth while to model. And the more fun it is too.