those look fine… gonna have to think on this…. as I said, we have not had issues with oembeds… and they are heavily used…
and Andy will be by in the AM and he may have some more ideas…
in the mean time, you can still embed youtube videos… you just cant use iframes… on the youtube site, click on the share button, and then embed… copy that code and paste it into a post using the tinymce html button… it will look something like
<object width="420" height="315"><param name="movie" value="http://www.youtube-nocookie.com/v/ZCdZtsiOWvo?version=3&hl=en_US&rel=0"></param><param name="allowFullScreen" value="true"></param><param name="allowscriptaccess" value="always"></param><embed src="http://www.youtube-nocookie.com/v/ZCdZtsiOWvo?version=3&hl=en_US&rel=0" type="application/x-shockwave-flash" width="420" height="315" allowscriptaccess="always" allowfullscreen="true"></embed></object>
when you paste it into the tinymce html popup