Will each game sell a million copies? Probably not 🙂 But maybe they can sell a hundred thousand each. That would be a strong incentive for LL to continue to develop new, simple, fun games with similar characteristics. They should definitely bring out Patterns for the mobile/tablet environment — but it would make sense to do that, say, for Christmas, which could mean more sales by then. It’s a realistic business model.
Of course there are risks. But LL seems to be playing it safe. They’re not being too original and following trends. That makes it easier for the gaming community to “accept” their games. Because, after all, the problem with an “unique” game is that only “unique” players will play it — an issue that LL faces with Second Life.