YouTube isn't the problem
YouTube is a service. They cater to people who want to showcase their videos.
The problem isn't that YouTube exists for this purpose. The problem lies within the ethics of the people posting videos.
Without proper ethics, you can post an exposure video anywhere.
When we exercise restraint and ethics and honour the magician's code, YouTube is no longer an issue.
I have a YouTube account (search for Soulgrind707) and you won't find ANY exposure in my videos. I also monitor and approve/dissaprove any and all comments. It's really not that hard to manage.
I don't see what all the fuss is about. And if you're worried someone will reverse engineer a trick from a video - they've been doing that for years - first by watching in person, then on video, then DVD, now the Internet.
If you REALLY want to keep your tricks 100% safe, don't perform them.
YouTube is not the problem - bad ethics and blatant exposure or poor handling that leads to exposure is the problem.