Hyperscript markup looks like a nice replacement for JSX. The source for hyperscript-react is 50 lines of code, including comments and empty lines, so it's fairly easy to learn:
To me this looks much less readable than the equivalent JSX. JSX has been such a non-issue for me, it's extremely reliable and you can use all the new JS map/filters, loops, etc. instead of learning some half-finished template language.