What happens to that crowd once you increase the average ticket price to be in line with other NRL clubs, move the kick-off time into a less fan friendly timeslot, only have the alcohol sponsor's beer on tap and increase concession prices to be in line with the NRL average, then strip all the people who have allegiances to other NRL clubs that are only there for the experience out of the crowd? The answer is that it almost completely evaporates.
There is demand for these kinds of lower cost, localised, more casual, family friendly, and traditional products, and it's a market that RL in this country has traditionally ignored to it's own detriment, especially in NSW/ACT. However it can only exist in the lower tiers where costs are lower, and any attempts to transplant it into the NRL would end in tears. That's especially true if that transplant was attempted at the expense of genuine attempts to grow the sport in new markets as is being suggested.
Perth and Adelaide's teams should exist to represent them and for the benefit of the people of Perth and Adelaide, not as an excuse to sneak a long defunct team back into first grade for the benefit of a relative handful of people from Sydney at Perth and Adelaide's expense.
It'd be a different discussion if we were talking about one of the Sydney NRL sides potentially relocating, but we're not, we're talking about clubs that haven't played in the NSWRL/ARL/NRL for 24 and 40 years respectively, and thus don't already hold licenses and bring almost nothing to the relationship that Perth and/or Adelaide either want, need, or can't get on their own.