XSLT is one of the most powerful and elegant technologies created in the last 15 years. Those who don't understand it and that's why can't use it, should just do their home work and learn better
We're using this metric over the last year but didn't give it this name. We're just getting this stats from git to measure the amount of efforts we spend on the code.. So, we'll try your ruby gem, why not :)
Sounds like a good idea, but how many sites/companies will adopt it? There are tons of similar ideas, but none of them are as popular as login/password...