Because it is 2nd tier necessarily is that clubs death knell . You seriously reckon fans whom.have supported a club in the most attended and viewed top flight rugby league competition on Earth would settle for 2nd rate status!? It just doesn't pass the pub test!
You are taking the narrow view that the second teir should always be relegated to a feeder system for the NRL. The NSW Cup should have stand-alone clubs. In fact for me there is no reason, other than historical that the QLD and NSW Cups should be separate competitiions. They should be one comp, all matches broadcast on Fox Leage, maybe one a week on 9. The comp would generate as much revenue and ratings as the NBL in Australia for example and they manager to fly teams around from NZ all the way through to Perth. The league should feature clubs that can't quite keep up at NRL level. That way they can play out of traditional grounds and keep route in their community. The NRL can be the big show in the big stadia and the Intrust Super Cup can be the community game offering fans a point of difference to the NRL. In the ISC would go initially with:
North Sydney Bears
Newtown Jets
Wyong Roos
WA Pirates
Fiji
Central QLD Capras
East Brisbane Tigers
Ipswich Jets
North Brisbane Devils
PNG Hunters
Redcliffe Dolphins
Souths Logan Magpies
Sunshine Coast Falcons
Wynnum Manly Seagulls
All other current second teir clubs can play a level down in QLD Cup and NSW Cup alongside any other feeder clubs that want to enter a team. This league could be very well respected and would pull decent ratings. There would be no shame in a team like Manly moving to this league, getting to stay at Brooky indefinately and renewing their rivalry with the Bears. It would in fact elevate the Bears from their current position as an NRL feeder club. This league could also offer want some fans want, traditional rivalries in family friendly time-slots e.g. Bears v Manly at North Sydney Oval at 3pm Sunday, afternoon grand finals (could kick-off at 2 - 3pm at ANZ on GF day).
Then the NRL competition can strop have split-personality disorder and move into the new stadia and the future knowing that the fans of the old-school traditions are being catered for. All new clubs can start from ISP. I know it is a different sporting culture in England but having the excitement of the new big city team in Toronto come through the lower leagues and put focus on some of the old traditional clubs has tugged at the heart-strings. With this two-league strategy, no clubs have to die and no clubs have to relocate cities or even home grounds if they don't want to, they just play in the league that caters most to their fan base.
There is no reason why the NRL can't set up these two league in this fashion to cater for all footy fans as well as inviting new fans to the game. It would be revolutionary and it would be the first of it's kind in Australia, meaning that it would place the NRL in pole position moving forward. Let's get in first, how long do you think before the AFL has a second pro comp made up of second teir teams? Once they do it, we will wish we have acted first.