The evidence is everywhere that newer all seater stadiums or at least improved facilities draw better than the suburban grounds:
Parra
Averaged 18k at Bankwest in 2018 when it opened, their 5th highest season average in their history, up 11k from the previous year. They had averaged 14k over the ten years before Bankwest opened.
Souths
80's pre-SFS average: 8k
SFS era (1988 to 2005): 9k
ANZ era (2006 to 2019): 15k
Dogs
80's & 90's pre-ANZ average: 10k
ANZ era (1999 to 2019) average: 17k
Broncos
Lang Park era (Suncorp Stadium - pre-rebuild, 1988 - 1992) average: 19k
ANZ Stadium era (1993 - 2001) average: 25k
Suncorp Stadium era (post-rebuild, 2001 - 2019) average: 31k
Canberra
Seiffert Oval era (1982 - 1989) average: 8k
Bruce Stadium era (1990 - 2019) average: 12k
Roosters
80's pre-SFS era average: 7k
SFS era (1988 - 2019) average: 12k
That is not even mentioning the same thing happening in AFL with all of the Melbourne, Perth and Adelaide clubs.