I'll be sticking with miniDV for a while. I would rarely inflict an unedited film of mine onto anyone, so the "benefit" of being able to put the DVD straight into a DVD player doesn't do much for me.
My main worry with DVD is the fragility of the discs - ie I have burned DVDs in the past only to find a year or two later that they are unplayable - they can get easily scratched or otherwise damaged. As far as I am aware, MiniDV tape is far more robust. Even if a section of it gets damaged you can still play the remainder of the tape.
The other reason for using miniDV is the uncompressed format, which makes it easier to edit. Have to admit, I haven't tried editing the compressed formats of DVD or HDD, so I don't know how much harder it is.
When I upgrade I would be looking at whether to go for high definition.