I think the concern over migrating plasticizers may be overblown. I've purchased old collections and cards from old collections with old sheets and holders that were brittle and piss-yellow and the cards have been just fine. Now I would definitely prefer to go with an inert and archival substance just so that I don't have to replace yellowed brittle holders in the future, but I don't think the cards are in danger from anything they are in as much as anything in them [i.e. lignin oxidation and acids].
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