I couldn't find the interview in your WSJ link, but I would think that combining the set registries would be a positive game changer for the value of SGC cards. Presumably, it would also mean that the SGC registry would be subsumed into the PSA one and that SGC and PSA grades would be considered equivalent in terms of value for set registry points and rankings.
If this is all the case, the arbitrage between PSA and SGC prices at a given grade should close very quickly.
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