Write in C

Take C. Switch it over to Lisp syntax (make a 1-to-1 C syntax <-> Lisp syntax converter). Add type inference and type classes (using the _Generic keyword in C11). Add Lisp-style macros (with an autoconverter to-from C preprocessor).

That would be a language of a century, my friend. Instead, everyone spends time inventing new Javas, new Pythons, and masturbating on over-engineered supposedly-safe type systems. What a joke.

>>7
Seems it's near-impossible to add type inference to C because of some ancient Kernighan&Ritchie relics like function parameters defaulting to (int)

http://stackoverflow.com/questions/6513806/would-it-be-possible-to-add-type-inference-to-the-c-language

The rest is totally doable, though.