Slightly controversial, but IMO Warner's done enough with his cricket career to say when his time is up. He knows he's almost done as well, so it's not like he's refusing to back down, but also the man averages 44.4 as an opener (Cook averaged 45.4), playing a lot of cricket all over the world (not just on roads in Australia, although that does push his average up a lot). Also, who's really banging the door down? Harris averages mid 20s, Renshaw doesn't open in Shield, Pucovski doesn't even play. There hasn't been any pressure on Warner's spot and yet he's delivered enough over a 10 year stint. A home summer where he can bully the West Indies and Pakistan, maybe pushing his average above 45, seems like a very fitting send off. Don't forget that for a period between 2015-2018, him and Smith contributed the majority of Australia's test runs (Could be completely wrong, but I remember it as around 40% of team runs between the two of them).