Dart was a victim of internal politics between the Chrome team, Dart team, AdWords moving away from GWT wanting AngularDart (see Angular documentary), and the Web in general.
Had Chrome team kept pushing DartVM, it might have been quite different story.
Carbon, good example of failure to actually know what the team purposes are. It is officially a research project for Google themselves, where the team is the first to advise using Rust or another MSL.
One just needs to actually spend like a couple of minutes on their wiki, but I guess that is asking too much on modern times.
Limbo and Oberon-2 were definitely not kitchen sinks of their time, their failure was that neither Bell Labs in 1996, nor ETHZ in 1992, were that relevant for the programming language community in the industry.
