"Smalltalk Revisited" doesn't solve any problems per-se, and would be firmly stuck in the chicken and egg corner that produced way too many stillborn projects in IT.
So, Chrome OS implementing Dart might have been interesting, but on the other hand, as soon as there was talk about adding Dart to the web platform, there were all those rants about "Google is monopolizing the web!!!!11". I guess it's hard to please everyone.
(disclosure: I'm on the Chrome OS firmware team. Although while "Chrome", there's definitely no Javascript or Flutter involved. My team's code needs to run in the absence of arbitrary amounts of RAM [edit-to-add: which means I have no stake in the game of which language has a hipster-compatible garbage collector])