Not judging (i'm the biggest carebear in my PvP server guild), but you've said yourself that the honour rules for PC vs PC PvP should be improved so that ganking will be reduced (I'm quoting you word for word here). And from the sounds of the honour rules, HK's are given for any kills of a toon that's not below a certain level range from your own. That's what we know at the moment. This means that it'll prolly disregard the situtational variables that the kill takes place in. Let me explain.
If you think that many vs. one fights should count as dishonourable (which it might be, since Blizz hasn't been completely specific as to what counts as a dishonourable kill yet), then there's plenty of other situations were kills would be 'dishonourable' as well.
If you get PvP'ed while you were fighting a mob, or while you were in the middle of medding, is that a dishonourable kill as well? What about if you had rez sickness? In the minds of some, such kills should be 'dishonourable' as well, and that the PvP honour rules should be tweaked to punish those who make such kills as well.
Unfortunately, it's going to be a pain in the ass to implement, which is why Blizz is most likely going to go for a simple 'If player lvl X kills player lvl < (X - 10) (or some other number), he'll get a dishonourable kill, with honour points spread out according to damage dealt'. There's too many other variables to take into account to filter out the truly 'honourable' and 'dishonourable' kills.
If anything, the rate of ganking (the type where a PC PvPs another PC in the middle of a mob fight, not the killing of some lowbie 20 lvls below) and zerg rushing is going to be nuts during the first week or so that the PVP honour system gets implemented. It won't be a good time to be non-lvl 60 on PVP servers that's for sure.
(Edited because I suck in math)
Yes, i agree with your statements, there are too many variables that need to be implemented to make the Honour system satisfactory to each and everyone. As such, we are stuck with the current situation and have no other choice but to adapt (basically suck it up la..heheheh).
I do hope that eventually blizz will come up with something....
p/s my apologies for passing judgement myself...