Kent's ranting is complete BS as usual.
Cherry-picking one of the many hip drop tackles from one weekend (where the NRL are trying to save face after many laughable non-charge decisions that weekend) and suspending that one player for 8 weeks (or even the 12 weeks that Kent said he wouldn't have a problem with) ... is absolutely not going to rid the game of the hip drop. coaches / players will still take the risk as long as the charges appear random.
now, if you were to hit every single player guilty of a hip drop with lengthy suspensions, well that's a different story. but the NRL aren't competent enough or willing enough to take that route, given they don't want a weekend where 5 players each get 6+ week suspensions (especially if those players are from some of the protected clubs in the game **cough** Storm **cough**)
just look at what they have done to the judiciary penalties this year, with the reduction in severity for many offences, like the shoulder charge, which they had pretty much eliminated, i wouldn't be surprised if it now starts creeping back into the game