Yeah you've never said anything like "a team in (e.g.) the Western Corridor would kill the AFL in Brisbane", f**king LOL.
The Brumbies current struggles are a reflection of RU's struggles on the whole ATM more than a reflection of their popularity and fanbase in Canberra.
It's only a decade ago that their attendance and ratings numbers were kicking the Raiders arse and they still hold the record for the highest attendance at Bruce. 15-20 years ago it was complete roll reversal and people were talking about the Raiders potentially relocating or folding. Just like the Raiders fanbase through the 00s the Brumbies' still exists, it's just gone dormant, but it'd come back quick enough if the ARU could sort it's shit out.
The Giants on the other hand are irrelevant. Their situation is not the same as a local Canberra team, they aren't considered a Canberra team, and they wouldn't even be amongst the most popular AFL sides in Canberra. It's at best disingenuous to suggest otherwise.