I have run through the data and have a rough estimate of how many of our pageviews are requested from browsers w/o strong javascript support. It is a preliminary rough estimate but I think is pretty useful.

TL;DR

According to our new pageview definition (https://meta.wikimedia.org/wiki/Research:Page_view) about 10% of pageviews come from clients w/o much javascript support. But - BIG CAVEAT- this includes bots requests. If you remove the easy-too-spot-big-bots the percentage is <3%. 

Details here (still some homework to do regarding IE6 and IE7) 

Thanks, 

Nuria