At the risk of being branded a heretic by some and a clearsighted prophet by others, HECK NO! If you're happy shooting film then by all means continue! Though it's becoming more of a niche product, film's going to be around for a long time because it provides something which digital does not.

As to the behavior of digital shooters, the biggest difference I've noticed is the number of shots they take. I picked up a 6gig MicroDrive and I have to shoot about 180 full-resolution JPG images before the "shots remaining" counter even comes down below 999. As a result, I have a tendency to take a lot more pictures than I did when I was shooting film. But I don't do too much other than check for decent exposure with that little screen on the back of the camera; Photoshop is the place to make those decisions.

In fact, I don't really see too much of what you describe from digital shooters. Where I really see it is in people who are unfamiliar with their equipment. Heck, I did it myself when my camera was new and I still do it in tricky situations where I'm learning new ways to handle the camera. Isn't learning new stuff half the fun?

As to the color of your pics, don't let that worry you at all. You like shooting with Velvia? By adjusting color saturation and curves in post-production, you can easily make any of your images look like they were shot with Velvia. Or Kodachrome. Or Tri-X or Daugerrotype for that matter. With digital shooting, it's the camera itself which captures the image information, not the film. It takes a little getting used to, but it's one of the things I really love about shooting digital.

I think you'd like the RebelXT. I have one and it's really reawakened the photographer in me. It's just wonderful. And yes, every single lens which fits your Film Rebel will fit the Digital Rebel and all of the other Canon EOS DSLRs too. The only exception to the interchangability of Canon lenses is those made specifical for digital - the EF-S series. Those won't fit your Film Rebel. As to the Quantaray lens, if it fits your Film Rebel it'll also fit all of the Canon DSLRs.

As to the difference between Film and Digital, there really isn't any more difference between them than there is between different kinds of film. Some will be more or less grainy, some will give you more or less color saturation, none of them are good in EVERY situation. I happen to like Digital because of the flexibility: I don't need to change film for a fresh situation, I just need to adjust the camera settings. I've got to confess that the ability to shoot over a thousand pictures on a single chip the size of a commemorative postage stamp has its charms too - imagine NEVER running out of film in the field again. But Film is just as good as it ever was. In fact, due to advances in materials technology, film is getting better and better despite the enormous popularity of Digital.

I'll go with Chipdoc in the main here.
As far as group shots are concerned, checking the background, pose and many other aspects of a group shot are best done through the viewfinder, wether one uses film or digital. One does have to take several shots anyway, film or digital, to ensure that an exposure was made where someone didn't blink or sneeze. Checking the LCD can be annoying to some subjects. The handy thing is that the digital image can more easily be manipulated to swap heads from one image to another should this happen.
Digital capture is not a replacement for knowing how to use the equipment and handle people.

I think what the OP is referring to about people taking awhile to get the shot is the point and shot digis. Standing there checking the live preview, couple that with the shutter lag(from what I've read is getting better) and you've most likely got 4-5 seconds which seems almost absurd when compared to an slr.

Well that's what I noticed at my last family function.

20D, yes that is what I was referring too. :-)
Thanks for the input Chip. I appreciate it very much!! I guess some of my next questions would be relating to the "digital world." Does everyone edit all of their images? As I mentioned before, who has all that time?? :-) Does the imaging software come with the camera?? Maybe deep down I'm not ready to move to the digital world.

Edit all my images? Heck, I don't even edit most of them. The only ones I do anything with at all are those which I choose to actually print. Most of them I simply look at.

Although your camera will almost certainly come with some sort of image processing software, it'll also quite likely be fairly basic. My RebelXT came with a fairly nice suite of interesting little software geegaws, but I use Photoshop for essentially everything. And no, it's not cheap. Or easy to learn. Or quick to do even after you've become fairly facile with it. But neither is processing your own film, which is essentially exactly what it is.