You don't have to sell me. I've had Javascript disabled by default for a couple of years now. I love it. I'm a technical person. I can handle (and have the patience for) fidgeting with settings to get sites to work.

My non-technical friends and family can't do that. Trying to impose that upon them would just frustrate them (and, for my family, increase tech support calls to me).

All my banking and insurance sites are useless w/o Javascript. Squarespace sites, Twitter, Imgur, don't work worth a damn without Javascript. I just gave up and mostly gave Google properties a pass to get Youtube to work. (I don't use Gmail so I have no idea how bad it would be.)

A site better be pretty damned compelling before it rises to the level of getting opened in an unconstrained browser setting. I just end up not opening a lot of stuff (or just closing it again when it lights-up "NoScript").