My gut feeling is Gracemere (and perhaps Parkhurst) has acted to keep a ceiling on house prices in Rocky. The de-amalgamation and the spectacular rates rises (particularly for IP holders) have also put a dent in things perhaps.
Also, reading the local news, there's been lots of talk about some pretty big housing estates and developments coming in 2014 and beyond in Parkhurst that may push up vacancy rates on the north side.
Maybe if Rocky/Gracemere can become a DIDO hub and a host for local mining support industries, it can absorb the increase in housing supplies and get back to a balanced market?
We've seen a bit of this in Townsville recently, which is having a similar experience to Rockhampton in recent times with higher vacancy rates and highly impacted new estates. There's been small price growth in many of the older existing areas, while the newer estates in places like Deeragun and Burdell have seen significant price drops in the past year or so.
Parkhurst (and Norman Gardens) pose an interesting dilemma. The only new estates being developed to date in any significant numbers are those around Norman Road. There are also large land holdings that are held by the likes of Stockland in both Kawana and Parkhurst which are going to be developed - to the west of Yaamba Road. The rate these end up being developed will be key to impact of prices - at the moment it is fairly slow going compared to the likes of Gracemere.
On the other end of the scale, it will be interesting to see whether some of the upcoming projects such as the Bruce Highway flood proofing and bridge works, the Gracemere industrial estate development and other infrastructure works will end up providing a push on demand. That may provide some relief on the south side when they do commence/ramp up later in the year.