I'm not sure Warner will tbh, not sure he'll get to sign off in Sydney like the probable plan is. But then again who will you replace him with?Likely replacements for Ali and Broad? Warner has probably saved himself yet again, though he really needs to go.
As for the next Ashes both sides have ageing players that need replacing. For the Aussies, besides Warner, you also have Khawaja and Smith who are mid thirties.
We'll be without Broad, Ali and Anderson for starters. Crawley coming in and being top run scorer is hopeful for the English, particularly with the way he plays
	
 
 It's kinda all plastic and concrete and lacks any soul, much like some modern football stadiums. The MCG capacity is double and it's 2 stops on the train from it. It was purpose built and designed with a roof, retro fitting a roof to existing venues as you say would never stack up cost or timewise.