There's a bit of a chicken-egg problem with a project choosing Dart, in that Dart has to already be ubiquitous for it to even be an option.
What is the pathway for Dart adoption? Google puts it in Chrome. Sure. Dart programmers get to deploy to the Chrome browser, so they do some fun side projects and they run on Chrome only. Fine.
Show me how Dart can then move to every browser on every device.
Then show me how whatever hypothetical process you came up with doesn't apply to any other language that currently exists.
If we're going to put a new runtime in the browser, Dart isn't the only option.
Dart's one advantage is very fast development cycle if you use Dart VM in Dartium. No js compilation needed. Very well designed user APIs, Excellent modularity (with pub) and good editor support eliminates many opponents.
What is the pathway for Dart adoption? Google puts it in Chrome. Sure. Dart programmers get to deploy to the Chrome browser, so they do some fun side projects and they run on Chrome only. Fine.
Show me how Dart can then move to every browser on every device.
Then show me how whatever hypothetical process you came up with doesn't apply to any other language that currently exists.
If we're going to put a new runtime in the browser, Dart isn't the only option.