Switching from Canon to Nikon today seems to be right decision. But tomorrow one may want to come back hardly. Because Canon's answer won't be late. I love this war!
Switching from Canon to Nikon today because D7000 is better than 60D, or because it's cheaper than 7D is just A NO SENSE.
New customers are the target, for those the D7000 is great, also for Nikon D90 users.
Canon customers with a lens collection wont have a single reason to switch (Just buy a damn 7D which is even better), and those Nikon new customers won't have a reason to switch in the future either, that's the point of the D7000, to build a consumer base.
It's much cheaper to buy a 7D, even it's $300 more expensive, than changing an entire collection of lens. "Switching" should be for professionals only, in a whole different level, for a whole different reasons. And even pros won't switch their brand just for a damn second body, mainly because Nikon's still better in wideangle and Canon's still better in telephoto, so switching should imply changing style reasons, or something "serious enough".
Both Canon 17-55 f2.8 and 15-85 lenses are BETTER than Nikon's 17-55 and 16-85 counterparts, and second hand lenses are much cheaper and easy to find, and those two reasons alone are WAY more decisive, in my opinion, for an advanced amateur than camera features.
Don't get me wrong. Nikon have impressive lenses for the professionals. 14-24 is unbelievable and canon does not come even close, but for the advanced amateur in an APS-C body, Canon's lens lineup is quite more adequate.
To sum up my opinion: Once you've chosen a brand it's basically stupid to switch, since no brand offers much better quality in ANY aspect. You may switch to Nikon from Canon, or Canon from Nikon, but your photography is not gonna improve. Your wallet is gonna get slimmer though.