I conducted more than 200+ interviews as a department lead and for me the single most important skill in an ever changing frontend landscape is enthusiasm and motivation.
How do you keep up with the current trends? Name some? Ain't it tough to learn new stuff all the time? How do you deal with fatigue in this regard?
What blogs/authoers do you follow? Do you work on Open Source or private projects in your spare time? What is the current version of ECMA, Framework etc. and when does the next come out? Name 3 of the last things you learned this year as a developer.
These questions really make enthusiasts shine. If I had to choose motivation over knowledge, I would always opt for highly enthusiastic people over knowledge people. Former will easily surpass the later.
Besides that I like this idea. Very good!