If the Aleague dies, than YES whatever is underneath that (in this case the Championship) will be, by default, the premier league in this country. How much interest and exposure it has is secondary to the fact it has to unite ALL clubs in Australia... Im not interested in how much money can be made out of football, just how much football can grow for all.
Promotion and Relegation has NEVER failed in this country, It has never really been given a chance to even exist properly or to be done fairly.
Why don't you articulate what it is that you REALLY fear happening here?