I've written this before, but it's not going to happen without a large amount of apps, that people actually want and can use. And that's not going to happen unless there's all the necessary tooling, especially for UI. mac/iOS and Windows have great support for building user-oriented applications. And then it still needs a centralized way to monetize the development work. And to get all that, you need a ton of paying users, not a bunch of freeloading tinkerers. It's simply not going to happen any time soon.