It's probably me mashing up terms-but even deinterlacing is nothing more than a parlor trick. I would equate it to ripping an MP3 at 96k mono and then burning that MP3 to CD. Sure, you can play it in your CD player, and maybe you even get some pseudo stereo added in with the decompression engine, but the quality can't possibly get any better than the source 96k mono mp3.
I resreve the right to be called clueless with regards to this, I'm just going on instinct. I've never seen a real benefit from 3:2 pulldown for video (stills are another story) and I've seen the impact of trying to push a 480i signal to 720p and I'd usually say that it gets worse rather than better.
