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OP author here; in another blog post I explored the growth in questions about some cross-platform solutions. Ionic (now Ionic2) has been growing quickly, and React Native is among the fastest growing tags on the site. So you may get your wish!

https://stackoverflow.blog/2017/05/16/exploring-state-mobile...

I have high hopes on WebAssembly. It's not the current intention but it could become a universal virtual machine.

Write command line apps in C. The only platform that can't run them is iOS.

iOS can run Objective-C which is a superset of C, you can run the code natively and use Objective-C to display it.

iOS lacks fork and kills your app if it doesn't yeild for some number of milliseconds. It also lacks a shell and a video terminal emulator which are kind of nice to have for these sorts of apps.