all this "jump ship" is so silly these days. back in the day photographers would invest in a camera system with the plan of using it for the foreseeable future, sure they may add to their collection, but they wouldn't ditch a system. My dad bought into the nikon system back when he was at RIT in the 70s with the original F, and has stayed with the brand ever since, now owning a D300 as our most recent nikon. However in addition to that, over the course of his career he has employed nikkormat ELs, a fleet of nikon FE/FE2s, 3 nikon F4s, a few hasselblads of which two 553 ELXs remain, two mamiya RZ67 ProIIs, a graflex crown graphic, a pentax 67, two pentax 645s, and any number of various polaroid cameras, now with the leaf aptus 75S as his sole primary work camera (the d300 is mom's) the only time nikon people in the past would have jumped to canon was sports people when AF was introduced.
unless for some reason I were to lose all my gear, and my father were to lose all his gear, I don't think we would ever consider canon, and even then I would go back to nikon for the simple fact I love their cameras, and have used them since I was about 3 or 4 years old. As far as I'm concerned there's only one DSLR system I'd consider going to, and that's the Leica S2, and that won't be till I'm out of school, with a job, and a few organs to spare.
I don't hate canon, we've actually owned a canon, it was a family camera just for snapshots, alongside my dad's favorite FE2.