I wouldn't expect to see a 1080i camera at a consumer price any time soon. But I do expect to see a 720P camera. This is probably wishful thinking, but I'd imagine that Canon could come out with a 720P version of their XL-1. Canon only makes broadcast and industrial lenses, no cameras, so they don't have an broadcast/professional market to worry about cannibalizing. The XL-1 lens system is sharp enough to resolve 720p, and 720 x 1280 CCDs are more reasonable to produce than 1080 x 1920. MiniDV tape should be able to hold an hour or more of 720P MPEG2, as opposed to the much less efficient DV format.
I'll admit I've been bugging a friend at Canon about this idea for the past year or two, and he won't say if they're considering this or not. Personally, I think it would sell wonderfully at $6000.