I considered this decision in January this year.
4 years ago I purchased an EOS 5 (A2E in the U.S.) with the Canon 28-105mm zoom. As my interest in photography grew, I added (and traded) various lenses. My interests so that they are now broadly three-fold;
1. Travel
2. Nature / wildlife (tele- and macro)
3. General 'snapping'
Before reaching for the 'phone with credit card in hand, I made the effort to sit down and review my collection of 'keepers' (FWIW I shoot Velvia and Elite 200).
Result? Most of my favourite images are from the travel category, and most of those were taken at 28mm. Also there are numerous times when I have missed shots through not wanting to lug around the EOS and 80-200 f2.8 etc.
The next most favoured set come from the nature / wildlife category, where results improved as I bought better glass, but were still not as 'pleasing' as the best of my travel shots.
Outcome? I decided that the 'horses for courses' axiom applies, and traded all my Canon lenses towards a 300mm f4 plus the two teleconverters. I also bought a 100mm macro (having previously had the 50mm plus life-size converter). That covers the nature / wildlife side.
For travel and general snapping, I bought a G2 kit with the 28/45/90mm lenses and the TLA 200 flash.
I carry the two sets in separate bags - a Mini-Trekker backpack for the Canon set, and a small Omni-Traveller for the G2.
This has proved to be an inspired move! The G2 is superior to the EOS as a travel camera because of it's size and weight. Image quality is equal to or better than that of the Canon (incl. 'L' glass). It also makes rather a good p&s for family days etc!
The Canon is far better suited to wildlife and nature.
In conclusion, I would urge you to think carefully about what you want from your photography. If what you say is true, and you are not worried about tele- or macro capabilities, then the G2 may well be a better system to own. However, every time you trade, you lose (assuming that you bought new, that is) so don't switch unless you can really see the advantages, and are sure your needs won't change.
This has become a little garbled, but hopefully is of some help.