Well if I was Timani, I'd be tempted to give this WC a miss (assuming he is not selected) and stick with the Waratahs, commit to Australia, get an ARU contract, focus on playing for Aus especially with the British Lions in 2 years time and get maybe two World Cups in. Out of all the locks Vickerman and Sharpe won't be around for the next WC so that would leave Horwill with Wykes/Timani/Simmons and Pyle in the mix. Or play for Tonga, earn bugger all for it, have to move overseas....
Yes the lure of playing in a WC this year might be hard to turn down but in the context of the next 8 years of his career... I think he'd be foolish to make a short term decision over a long term potential career that could be very succesful, financially lucrative etc.