My opinion, It would make an excelent first digital camera. I think you may be dissapointed in the quality of enlargements made to "very large sizes." I too have a history with Canon SLRs starting with my first camera, a Canon AE-1 from the mid/late seventies. This is why I bought a Canon digital camera when it came time to buy.
I was hesitant to buy a digital because I was worried about resolution with larger enlargements... Then I pondered the following facts about the last 25 years of my photographic background. 1) I NEVER have made any enlargement greater than 8*12, and the vast majority of my prints are 4*6. 2) The negatives of photos once beautiful and prized, made with decent camera bodies and great lenses are now not found, or scratched, or no longer in shape to make decent prints.
I think I can preserve digital images better than film, prefer the immediate feedback of digital, and am tired of scanning to email, post to WWW, etc. Digital for me is now.
While the cost is dropping quickly on digital cameras, I think you should buy a high quality film scanner and continue to shoot on silver. You will be greatly dissapointed when you shoot that perfect shot and want to print it at "very large sizes."
As far as waiting for a larger number of pixels, remember that the picture is two dimensional, and that DOUBLING the number of pixels improves the pixel density by only 41%. (hope i figured that one right) If you want to wait for more pixels, I would wait till you can hit 8-12 megapixels and can double the pixel density. I doubt very much that you will see much of a difference between the D30 and a 6MP camera (D-60 ?). My guess is that a 3MP D30 will blow the doors off any prosumer 5MP that is available now. Don't get caught up in the MP, check out the other features that will make decent pictures.
Lastly, check out the pictures that Pekka has on this site. The D1 and the D30 shots are great, but spend a few bucks getting one of these images blown up to 30*60 and see if you would be satisfied.
Good luck, and whatever you do, have fun. It's a great hobby.
PJ