I don't even think it needs to be modernized as it has become quite easy to use, even the standard configuration provides some protection*. It needs to be popularized. But for that you must offer a good explanation to common people why their data is worth so much in aggregation and that they might not want to share too much. Far more difficult problem than making it more accessible on the technical side.
* and some disadvantagse to privacy if the number of users is low.
* and some disadvantagse to privacy if the number of users is low.