Market yourself. Write a book & give talks about your process for making winners. Lots of people want to know how to make money in the App Store. There might be a higher-priced corporate training market for how to make popular apps for marketing purposes (think packaged food or sports apparel industry).
On reading your blog it looks like you're already going down this road?
Ehh, anyone who bothered to email me has gotten the stuff I know for free. I don't want to give any talks or write a book. It's easier and less stressful to just make the apps.
Yes. Just make sure you also publish on your blog or so the stuff you send out in emails. That helps build a reputation, in case you need to resort to writing a book or giving talks (or doing some other corporate training as a consultant) later.
You might also use some of your money to pay another guy to polish your writing. Or to compile it into a book.
Well, your post was about what you can do when you can't rely on the apps for income anymore. Personal branding is something that you can capitalize off in many ways.
On reading your blog it looks like you're already going down this road?