I agree with the above post about honeymoon. When I started with digital SLR - all my film cameras were sitting on a shelf for a long time. About a year long. But after that I just felt that something was missing. I did get good photos from My Canon EOS 10D, I had all L glass and yet , after a while I felt that I didn't always wanted to take camera with me whenever I went out. And I hated that. I love photography and yet - something just was not there anymore. So, I got me a Voigtlander Bessa R with 35mm Ultron. And I felt alive again. Not really just because its film, but more so because its a compact, comfortable combination that delivered a very high quality photos and most importantly - joy to use. I really enjoyed having camera with me all the time again. Shortly after, Leica and other RF gear followed. I own and use many different cameras, but no more DSLRs. I have a small digital Casio that does a good job when I need it to, but its mostly Leica that I use. Just the other day I had my M3 and Rigid Cron out at a party, and it felt wonderful, while everybody had their little Digicams. Got some funny looks, but - I don't care.
I think that digital photography is a good thing - as an alternative. As someone already said - it brings a lot more people into photography. But film, be that Leica or any other film camera - is a lot of fun too.
Another factor for me - is holding actual photos. I know, I know, you can have photos printed from your memory card. But in my experience, I was just mostly putting them in a hard drive and looking at them on a PC screen. Not the same. And I have a good scanner/printer if I need to print something on my own.
I think all cameras are or can be great - in one condition - if you use it. So, use your new digital Canon, enjoy, and keep the Leica just in case you want to use film. Bottom line (for me) is that - camera that you take with you, love to use - is the best camera. Everything else is secondary. It just has to feel right. Now - all that , of course applies to photography as a hobby. If it's your work, some things will or may force you to use a specific camera/medium. If you lucky - its the same as you enjoy already, but it doesn't always work out that way.
Best of luck with whatever road you take, as long as you enjoy the ride.