I agree 2D will always have a great place in gaming, for sure. Any future IIDX that comes out, just has to be 2D. I mean, I like Amplitude/Frequency, but those music games have their place in 2D land. As for shumps, ones like Cherry blossom and ESP Ra De take the cake for manic 2D kickassness that I haven't seen replicated in 3D.
Yet games like Mw2, halos, etc look beautiful on a huge ass HDTV with HDMI and JBL speakers. mmmm