I have no doubt they wouldn't want to play there, I also have no doubt that it's the only way a Govt funded built stadium would come. Don't forget, they play out of Govt owned stadiums now that only get used a handful of times a year each for NRL games.
Please note that I am not advocating this idea, just being realistic on how it could possibly happen.
Unless the NRL buy half of Endeavour and spend cash on it, as I can't see any Govt spending much, I'd say the SFS will eventually become the "home" ground, with a load of buses from the Leagues Club and back.