We're in a very, very strong local maxima with plain text source code. In order for a rich-data source language to work you'd need to implement, competitively with what we have for text, the language itself (which is already a hard sell, look at how difficult it is for even phenomenal languages to gain a foothold) including built-in macro and codegen systems, a compiler, at least one fully-featured editor, complete with linting and code suggestion and search and an input mechanism competitive with just typing out text, possibly more than one to support the wide range of opinions about editors ranging from IDEs to Vim, source control integrated with means for sharing and collaborating on said code, and every other convenience you get for free from choosing plain text.

Basically, you need to sit down and build the greatest programming language ever conceived, complete with a world class ecosystem, and then convince people that this is truly a revolution software development, and you probably won't make a dime off it because proprietary programming languages are evil.

Good luck?