the altcoins will want to take their chance and feed on bitcoins corpse
There are so many of them that it's impossible to say which one is the most relevant or most secure. Most people still regard Bitcoin as the constant which all these alts revolve around.
I'm actually just paraphrasing what he said.
That's funny, because I didn't see him mention that "panic selling" was going to occur, and in the article I didn't see any assumptions about price, just about usage. You're still assuming that speculators are rational, when this is often not the case.
Perhaps you're getting the term "paraphrasing" confused as well.