The linked site won't display anything with Javascript disabled. Yet, when Javascript is enabled, we don't get a "web app", all we get is a page of text that could easily be coded in HTML and CSS. Presumably, building this site in meteor makes things easier for the developer. Does it make things easy for all users of the site? Look at the source code of the page after it's loaded.
...
<body>
</body>
</html>
What would a screen reader user hear? Is this site accessible? Does anyone really care?
Do sites like this point to a future where more and more web sites (not web apps) are built with Javascript frameworks? Is this a good thing? And can these sites acommodate all users? (Assuming they want to.)