Do you ever think that cloud mining will become profitable again?
It still is, just over a longer period of time.
This is not true. As it stands now it is not profitable having your GHs running at CEX. They will become even less profitable as time goes on as the difficulty tends to increase (although the adjustment in ~3 days will likely be an exception to this). You need to remember that when you are cloud mining verses "home" mining you are adding an additional layer of people who need to profit which will make it generally less profitable then if you purchased your hardware yourself
He never said CEX.IO. He said cloud mining. All the manufacturers offer their their own services now so it means being able to mine without having to pay for shipping, PSUs and ridiculously expensive electricity.
That is just one example. A PSU is just a capital expense and can be sold when you no longer need it for nearly the entire cost. You still must (indirectly) pay for shipping as the manufacturer still needs to ship the miners from where they produce them to wherever they will be hosted. Electric costs vary from place to place so your argument that you pay higher electric costs by running them at your home is invalid.
This topic is about cex therefore it should be assumed that he was talking about it. Even if he was not then the overall point of my post is still valid. Mining rewards (net of maintenance) will generally decrease over time as the difficulty increases (although this time around the difficulty will decrease, although not enough to counter the fact that the price of bitcoin has fallen so the net mining reward will still be lower)