The chairman of the board of the ABC, Justin Milne has said the broadcaster's future is in digital only, and failure to invest in it now would cause it to wither and die in the future.

Stating the current political storm around the ABC as "situation normal", Mr Milne maintained the case for the ABC to ramp up its expansion into the digital realm.

"Let's be clear: if the ABC were barred from serving audiences on digital platforms, it would wither away and cease to exist," Mr Milne said.