Negative.
You already failed at your first 2 sentences.
JSS is a better abstraction over CSS
Better how? Why you even need an abstraction in CSS ,omg?
It uses JavaScript as a language to describe styles in a declarative and maintainable way.
This is how CSS already works?
So, in one sentence regarding CSS what main, real world problem JSS solves?
Please, stop making another pseudo-temporary-solution. If you consider there should be something changed in the Web Standards, please participate in discussions, working groups, contribute.
CSS, of course, is not ideal, however, overall I don't have big problems with it. I have own simple, maintainable CSS architecture based on ITCSS and BEM principles.
What I can consider, on the other hand, is the idea of CSS Houdini working group and upcoming spec.