Out of the three last gen consoles, one was too weak to be targeted in cross platform games, one had an Nvidia GPU, and the one with an ATI GPU had a unique architecture that never showed up on the PC. Of course this never had a benefit on PC gaming. It also meant that cross platform games could not be optimized as heavily for dissimilar consoles.
This generation, both of the consoles that actually matter for cross platform games (Xbox and Playstation) are using the same base architecture, and so is AMD on the PC side. They've given hints that GCN is going to be fairly long lived as well. It's an obviously different situation.
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