They never have and they never will. The first such effort was Lisp 2 from 1966 or so; it was basically Algol 60 with lists and list operations. See the links at Wikipedia. Lisp 2 should not be confused with Lisp-2, a name for Lisps like CL with separate function and ordinary values of identifiers, or with 2-Lisp, a design for a Lisp based on normalization rather than evaluation (so that 2 => 2, but '2 => '2).
> There's also srfi 49, srfi 110 and srfi 119
These are the indentation-sensitive syntax SRFIs. Did they catch on?
There's a recurring cycle in the Lisp world where every 5-10 years
somebody proposes a new "conventional" syntax :) I feel the opposing
camps are not able to communicate. It's the Lisp version of the tabs vs
spaces debate.