Joe Hildebrand thinks Dutton just killed the liberal party?, page-14

The Yes/No vote in polling seems to be very cleanly split on generational lines. In even just 5 years time, as more Gen Zs come of voting age, the Voice will have overwhelming support.

That's what Joe's referring to and why he says Dutton is consigning the Liberals to future electoral oblivion. Even if the No vote gets up - its only a majority decision at this point in time.