In an exclusive interview with the Herald Sun, Australia's leading Catholic has warned a dying generation of priests needs to be replaced.While declaring the church strong, he warned another two decades could leave many areas bereft of priests, brothers and nuns.Dr Pell believes Catholics must receive communion at Mass each week to ensure the religion is sustainable in Australia.There was no future without priests in parishes, he added, calling for ordinary Catholics to consider taking on greater lay responsibilities."And I say to the young people: it's very simple," he said in his Sydney office. "Unless young men come on board, the Catholic Church will topple over."