It is an approach that has already seen some success in Python. Languages often have constructs that are reserved for future use or that "parse but don't validate". JS has a lot of reserved keywords (thanks to ES4 and ES5, especially) that "don't mean anything" today but could in the future and still parse even though they'll give a runtime error. Beyond that, almost every language has a syntax for comments. Comments don't mean anything to the parser/compiler either, but they mean a lot to the people writing the source files and they still need syntax to write them.
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It is an approach that has already seen some success in Python. Languages often have constructs that are reserved for future use or that "parse but don't validate". JS has a lot of reserved keywords (thanks to ES4 and ES5, especially) that "don't mean anything" today but could in the future and still parse even though they'll give a runtime error. Beyond that, almost every language has a syntax for comments. Comments don't mean anything to the parser/compiler either, but they mean a lot to the people writing the source files and they still need syntax to write them.