I think it's saturated. Lean goes best with the easy to execute ideas--where a viable product is possible in days or months. Take an animation software progr

I think it's saturated. Lean goes best with the easy to execute ideas--where a viable product is possible in days or months. Take an animation software program designed for professional artists: it's not possible with only a few features, because it wouldn't be competitive with existing products. You need such a large array of polished features to have any staying power. Let's also say you want to make a product with better core functionality which can't be done with 3rd party add-ons or working with existing software. There's still a lot of opportunity for people willing to work on something for several years before releasing, as long as they aren't taking gambles with their primary value proposition. (Would hate to be wrong after spending that much time) There are still untapped niches where lean works, though, I bet, if that's your calling. My backup, if I'm making a product that people don't use, is to be my own customer, and open an animation shop which uses the software to make animations to sell to people. So if you're not going lean, go for a product you will use (and obviously a product that is useable by only one person[not a social network]) to make money, if people don't buy the product itself. (Ie, if you're making software that makes it easier to host websites, make sure it's software that you would personally use in the case that you can't sell the software, but can still sell the hosting)