>So Mozilla isn't exploring terra incognita here, and if there's something to be found I hope they find it, but I expect nothing.

This post was written in 2015. Looking back I think we can infer:

1. They found a solution (create a new language)

2. From the success of that language, it seems to deliver on its promise (although it has its warts)

3. They failed to incorporate that into the web browser because rewriting a web browser as a momentous task that had little measurable business impact; and decided to layoff the engineers instead.

Google is a wealthier company, but they may decide that trying to "fix" C++ is a more realistic endeavor.