I switched from scanning film to the D30 a couple of years ago, and found it much better for color work, but a little lacking for B&W. Key to using a film scanner is finding a film that works well on your scanner. I used to shoot Reala 100, sensia, and TCN400, as they scanned on my HP scanner with very low grain aliasing effects. I've just upgraded to 300D, and am selling on all of my film stuff but an old Rebel. Plus, how many films do you shoot and develop anually? With digital you won't have that expense.
Going back to film from the Canon CMOS sensor I'd have to shoot 6x7 to be happy with the quality. I took a trip round the world with a contax G2 shooting reala. I love that camera, but I know I'd have got better quality with the D30.