Yeah. The main thing people probably want is "TeX quality" typesetting of mathematical formulas inside web pages. Bundling the entirety of TeX inside a browser for this purpose would be kind of a hack, and suboptimal in many ways. I think that instead of just using TeX as a black box, it would be more interesting to actually learn what makes its formulas look good, and apply these lessons in modern software.

There's a related article called A Functional Description of TeX's Formula Layout [1] that describes a more modern reimplementation of a part of TeX.

[1] http://citeseerx.ist.psu.edu/viewdoc/download?doi=10.1.1.39....