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 that drive spread of language, not "huge corporation with infinite budget and a large full time team of contributors and evangelists." Dart had no short of those and still not much accepted.
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 that drive spread of language, not "huge corporation with infinite budget and a large full time team of contributors and evangelists." Dart had no short of those and still not much accepted.