Earlier quoted context omitted.
Well TypeScript also had a huge corporation with infinite budget and a large full time team of contributors and evangelists which probably helped adoption.
Counter-example: Dart. If corporate support is a definite factor, Dart would have taken off way earlier than now. A bigger factor in TypeScript's success would be the ability to gradually migrate the projects as it's a superset of JavaScript. How do you start migrating? Flip the file extensions from .js to .ts with loose compiler options, then gradually add typing as the options are tightened. It's factors like these…
From an external perspective, Google's enthusiasm for Dart seemed half-hearted at best. Its launch was encumbered by rocky political issues, with half the community terrified that they were looking at a new VBScript, and Google's competitors actively stoking said terrors. It could've jeopardized Chrome's ascendance by turning off tech people, on whom any new software depends for propagation, and giving MS/Apple/Mozilla some room to doubt Google's commitment to the extant web, and that was surely enough to make pouring heavy resources into it a non-starter from a business perspective. It's naive to believe that any technical considerations entered into it.
Take a look at Kubernetes if you want to see what happens when Google is committed to using that G-Juice to cram something down the community's throat.