Hmm, that's a tough one.
I too would probably have had them restored but then we are flying too close to that other story of the Thunderball quad that had had the art cut out, linen backed and then all the titling restored on archival paper - which is probably what would have been the case here too.
That said, in percentage terms of square footage of paper restored, this would have been less than the quad.
Also, Thunderball quads are readily available. These cards are not.
Really dunno...