While I'm never one to say that Hollywood is full of angels and saints, this is a technical limitation - DVD is limited to 29.97 fps (frames per second), which is standard NTSC video framerate. For 3D to look good, you're going to want at least 50-60 fps (i.e. 2x either cinematographic or NTSC framerate), and Blu-ray is necessary to support this.
Depending on your kit, it is also possible to support 3D by bifurcating the image horizontally or vertically, but again, the maximum resolution supported by DVD is 720x480 - if you halve this, we're down below analog TV land, and it's going to look like shit. Blu-ray supports a much higher range of resolutions and frame rates, and includes a specific 3D spec of up to 1080p.
Hope this helps make a little sense of the situation.
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