Well, it's great for the Australians, no doubt. He's the biggest player ever to play in Australia, that's for sure. But that doesn't mean this project has a big chance.
They said Ale will be their Beckham. This transfer is not even close to Beckham's. All the world was shocked when Becks- still young back then, for sure comparing to Ale today- left Real for 50m-per-year in LA. Ale's move looks for most of the world like a 38 years old player found his 'Del Boca vista', that's all. Old player makes money, that's how it looks. Plus, Beckham is a bigger celeb than Ale, worldwide.
Now- Usa did and do much more to develope football. It has more money, better stadiums, and they try since the 70's. It started with Pele and the Cosmus, continued in the 90's when they created the MLS and many old guys joined (Stoichkov, Valderama, Mattehus and co.) and recently with Beckham and Henry. And still, most people in Usa don't care about Soccer. It's better than it was 20 years ago, but Beckham and Henry's move didn't have the effect the league directors expected. They only attract old fellas. Plus, we gotta admit, USA as a country attracts people much more than Australia, no offence.
So I don't think Ale's move will have a dramatic effect on Australian football. Right, more fans in Sydney's games and all, but that's all. This league barely exist (teams changes every year, losing their license and all this shit), no way Ale by himself could turn it to something close to the MLS. And of course I hope I'm wrong, I wish him all the best there. I hope it'll be a huge success story. But I don't think so. I just hope he knows exactly what's the level of football there and won't be shocked when he arrives.