Personally I reckon this is classic case of "barking up the wrong tree'. Of course FFA would love nothing more than stable ownership of at least one more club outside Melbourne and Sydney, regardless of how much croud we pull in for their games. Seriously.
The real reason might be somewhere else - it may be that it is not actually up to FFA to give 10 years to us but they can't say so. I reckon the real decision makers on this are in AFC (since Australia is a member of Asian federation and HAL is an AFC competition), and also perhaps to some degree in OFC who need to continue to give the Nix their blessing to play outside Oceania club sphere (correct me on the OFC bit if I am wrong).
So it is a bit of a power game. I believe that FFA would actually be keen to give us ten years as it is a win-win. We would get a club continuity, and they would have a more stable A-League membership assured.
Now, why would AFC care about that? They only tolerate Australia grudgingly anyway, but largely accept they're in AFC to stay.
Persuade the AFC to give us (WelNix) ten years, and FFA will rubberstamp it.
AFC are all businesspeople so they understand how to do a deal.
Maybe we need Tim Groser to discuss it in the round of trade talk. A couple of live sheep exports and suddenly we are in.