[alex1]

You're right. Maybe if they turned on and required SSL for everyone visiting www.youtube.com and added www.youtube.com to Chrome's preloaded HSTS list and somehow got everyone to use Chrome. Sadly, this probably won't happen, but DNSSEC adoption probably won't happen either. Even with DNSSEC, they could still do deep packet inspection on HTTP traffic going to YouTube IPs and initiate MITM attacks that way.

[psykovsky]

Why not ditch the current DNS system and use Namecoin? If you have to force some piece of software into users computers, let's do it right at least...