That looks interesting, I'm not likely to write any jQuery any time soon, but I'll check out the source code to see if I can learn anything from it.
Regarding adoption levels, the JsViews website made me think I had accidentally toggled the "Desktop Site" option in my Iceweasel browser, I wonder if that scared people off. Or perhaps it's because, as others mentioned, most jQuery development these days is in legacy codebases where the devs are not allowed to add any new libraries, reducing the adoption rates of any new jQuery libraries even more than you'd expect based on the raw nrs of jQuery users.
(the website does work though, and it loads fast. Which is something I've always appreciated about jQuery based sites still alive today. The only thing I'm missing is any indication of how big it is when minified + gzipped. EDIT: jsrender.js is 33.74 kB, jsrender.min.js a mere 12.82 kB)