Storm have never had the bandwagon like the Swans had in 86 - 88 and at ituer time over the years. Their support is fairly hardcore. There is not much crossover with AFL fans in my experience. I doubt their crowd would drop as much as the Lions for example, should their from drop.2020 is a silly base year. NRL had no presence in Melbourne at all because of Covid.
In 2016 the average Melbourne audience was 641K for the NRL GF.
The NRL has pockets of support in Melbourne but mostly is, because of media relationships with News, nine and SEN, has a decent casual support among AFL fans. The best determinate of what the the TV ratings for the Storm will be in Melbourne at prime time is whether there is an AFL game on. I would hazard a guess that the same thing plays out on foxtel / kayo in Melbourne.
There is no real sign of growth and no real evidence of primary supporter base (i.e unlike the Swans in Sydney). And this is a team that has missed the finals once in 22 seasons and that was only because of the Salary cap cheating penalties. They have:
-finished outside the top 3 times in 19 seasons
-minor premiers 9 times in 19 seasons
-5 premierships (inc those not recognised)
-10 times G finalists
Essentially they have the success profile of a top soccer team in an uncapped european soccer league.
If and when (there may never be a when to be fair) they have a down turn, we will get a better look at how well the sport has established itself in Melbourne