I think Alex De Minaur will definitely be someone to watch in the coming years! He did a great job at the Brisbane and Sydney Internationals - and I really hope he can make it through the first round against Berdych (although it will probably be a challenge). Nevertheless, he clearly has a shitload of potential and seems very self-disciplined and humble.
Regarding Kyrgios, I feel like he has really copped it in the media. Obviously he's behaviour has been poor at times, but the media have really publicised and scrutinised every mistake he has made, without considering:
1) His point of view and the circumstances surrounding his behaviour, and
2) The fact that there are plenty of other athletes who have displayed poor behaviour, especially when they were younger. For example, Lleyton Hewitt was quite immature and had his moments when he was younger.
I'm not saying Kyrgios' behaviour is excusable, but I think it's important to consider the above, and remember that the media's portrayal of him is almost always going to be biased and negative. E.g. I only saw two minor articles about Kyrgios starting a Foundation for underprivileged youth; but see plenty of repeats of Kyrgios' outbursts on the TV.