If you MUST use a framework, then yes i would go with ember because they have a prooved commitment to following the web standards rather than creating their own custom standards that they throw away the next year.

Having said that, 30 years are very VERY long time in web development. Maybe pure js isn't a bad call, but it depends on how large it is going to be. Someone else mentioned considering sever rendering, not a bad cinsideration either.