Those kind of domains don't really have any value because of their extension and also they are not CEO friendly like .com , .co , .NET , .ORG etc. ..
You mean SEO.
It should rank still as long as the website owner add fresh contents and optimize the site for search engines. blockchain site has .info extension and look at it.
blockchain.info has immense, organic traffic. else it wouldn't be top in google. every domain extension that is not .com or .net (maybe .org) is difficult to setup on top spot in google.
that being said, those new tlds are absolutely worthless, if you don't plan on building a product with traffic