They did in fact, until Sony removed the backward compatability.BlackWolf said:This is quite true, and they'll probably sell some DS's anyway if people don't go for the 3D effect. I mean just because they's a PS3 doesn't mean people stopped buying PS2s straight away.
Saddly they didn't also rerelease the PS2, outside of Japan, when they did that.
PS2 games were still being released for a long time after the PS3 launch.
i'm shure there's a huge backlog of in development/localisation DS games to come out yet.