Short bio: Computer Scientist, FOSS supporter (read more)
Tux Machines (TM)-specific
The real problem is Adobe Flash, on which much of the 2.0 web is built on. Even if libraries restrict the use of online video (many do for both content and technical reasons), Flash is necessary to view and use *many* websites, and seems like most corporate web developers assume that Flash is a given. Unfortunately, in the Linux world, it's not a given and it's not because Linux is not capable of running it - it's because it's proprietary software.
So because of the Ubuntu project for libraries, a Flash-free environment was already on my mind when the Flash security vulnerability was announced (and not just because of Apple's hypocrisy on the Flash/iPad issue), and I have begun exploring how I might wean myself off my Flash dependency (mainly for YouTube and Pandora, both which I use heavily). I spent the first part of the weekend trying to live with Gnash with disappointing results.