i've got no problem with 10 ODI's in two 5-match series. After all, CA and state associations will be much happier with a certain 10 ODI's involving Australia as opposed to 8 plus 4 between the visiting countries and 2 in the final series which *may* include Australia. Add the NZ series in and that's 13 certain ODIs involving Australia here over summer, hopefully with the Gabba hosting two of them.
It will be interesting to see how much the format will change in the 2006/7 summer...I think they'll have the ODI series v NZ, then the 5 ODIs against one of the touring sides followed by three tests (probably Gabba, MCG, SCG) followed by two/three tests against the second touring side (at WACA, Hobart, Adelaide), and then 5 ODIs to round it all off, or maybe the 5 ODIs first as it's been made clear that Adelaide want their Test across the Australia Day weekend. Of course when England tour there'd probably be only 5 tests so they might have an extra two ODIs or something, and play a touring side such as Zimbabwe or something like that in a 3-match ODI series....
I think Hobart will be able to handle a test match again, the pitch, stands and general quality of the ground appears to have improved a fair bit over the past two years.