This sounds like apologia from a big closed publisher (AAAS) explaining why open-access is supposedly bad. See, sometimes open-access journals fold, and when that happens, nobody knows what happens to the articles. But they'd like you to ignore two inconvenient facts: First, that traditional closed publishers effectively lose all articles by default by this metric! And second, that the Internet Archive, itself open-a…
I don't really agree that traditional publishers lose all articles by default by this metric. I think there is some value in a reliable record of the journal itself, as more than the sum of its parts.
Still, my preferred solution for all of this is like JMLR -- very low-cost and open access, and it has reliability by virtue of association with a top university, and prestige by virtue of its editorial board (which becomes self-fulfilling).