Which is why it should be as simple as explaining how to configure your browser to view flash or pdf content. Obviously there is only a reason to do so if it enables access to some content that's useful to the user. Such content could be expected to be developed more readily if it was at least easier to get to the sites.
What kind of content is going to need protection from DNS seizures (besides the gambling example that's going to be used here, I do believe people have a right to gamble their money be it on the internet or Las Vegas and wont argue about that)?
To my mind springs instantly certain sites & services, not talking about Silkroad.
Mostly sites that practically contain evidence of crimes against young human beings.
Those people are batshit crazy and paranoid about security & anonymity due to prison realities against their kind.
Then again, I could see legitimate activity as well that could be at risk of seizure in the future such as Bitcoin business, prepaid cell phones/visas, online payment processors similar to e-gold, or torrent sites.