Javascript compatibility is the least important part of json, lots of people use json with python or ruby or rust or java or c for things that will never interact with javascript, and anyways you don't want people to parse json with eval or confusing json with things that include string concatenation or function calls adding non javascript syntax helps make that clear.
There is a good reason to not change JSON(backwards compatibility, updating parsers, confusing formats, ect.), since you're not planning on parsing javascript with eval there is no good reason why any changes made in JSON 2.0 have to conform to a subset of javascript.
I think if breaking changes are made, there is no point, it would not be called JSON 2.0; it is an entirely new data format. When there are hundreds to thousands of alternatives, trying to "fix JSON" isn't the solution. JSON works because it is simple and easy to follow, it is robust and flexible, and has no restrictions. There is no good way to store dates in XML or many other formats, without the use of Schemas, and the syntax changes are minimally beneficial. It wouldn't save a lot of bandwidth with gzip, and the text data likely doesn't add up to a lot of disk space when compared to the data being stored; so removing commas which make parsing JSON easy and increases its adoption and usage, just so some people can have less linting errors doesn't seem like a large benefit.
Javascript compatibility is the least important part of json, lots of people use json with python or ruby or rust or java or c for things that will never interact with javascript, and anyways you don't want people to parse json with eval or confusing json with things that include string concatenation or function calls adding non javascript syntax helps make that clear.
There is a good reason to not change JSON(backwards compatibility, updating parsers, confusing formats, ect.), since you're not planning on parsing javascript with eval there is no good reason why any changes made in JSON 2.0 have to conform to a subset of javascript.