The funny thing about the Unread story is that if he keeps on releasing new paid versions (like Tweetie 2 or Tweetbot 2) and then charges for them, he'll just have that much larger of a base to launch on, and will make more money.

I believe it's not just about the caliber of apps, it's about the caliber of business that releases the apps. They need to consider marketing, pricing, launch strategies, and app store optimization. They need to maintain a relationship with their customers, and constantly ask what the customer wants. There is a lot more to a mobile company than the app, and I think the best companies (and their apps) are the ones that will survive.