I think people are getting a bit carried away with the Gosford crowd. Now there is no doubt it is a great crowd, and one that I don't think South's would have got at ANZ based upon their crowds in general this year (and the fact ANZ is really really on the nose with RL fans in 2019), but 1x 19.5K and 1x 14.6K crowd doesn't mean a team in the region would suddenly be nearly filling Grahame Park each week.
Gosford has shown if you give it a decent game at most Saturday / Sunday timeslots (especially if the sun is shining) they'll turn up, which is better than some grounds at the moment, but as shown in the past Thursday's and Friday's are terrible for CC (could you imagine a 6pm game at Gosford on a Friday?) and games against poor opposition don't rate.
This year will also be only the 3rd time since 2000 that the avg. for Gosford is more than 16K when the venue has held 2x or more games in a season...