I understand where you are coming from, and therer will be many who agree with you. If the number of Sydney teams were cut there would be a lot of pain in the short term, but its the long term viability of the game we should be concerned about.
The game could continue as it is with 9 Sydney teams, and it will coast along for the next ten years or so. In that time while we find the usual peaks and troughs with crowds, more then likely number will continue to decline when looked over much longer period.
If we want the NRL, not just to be around in 20 and 30 years time then hard decisions will have to be made.