Shell Gamehttps://en.wikipedia.org/wiki/Shell_gameThe shell game (also known as thimblerig, three shells and a pea, the old army game) is portrayed as a gambling game, but in reality, when a wager for money is made, it is almost always a confidence trick used to perpetrate fraud. In confidence trick slang, this swindle is referred to as a short-con because it is quick and easy to pull off.
https://pbs.twimg.com/media/C-e16GsXkAAmAcR.jpghttps://pbs.twimg.com/media/C-NS6HSWAAAJHZU.jpgThere's a lot of people currently living in mansions earning millions for doing nothing. They're all insolvent. It's not going to end well.
It doesn't take a prophet to see that it's only a matter of time before all these exchanges collapse.

Now is your last chance to withdraw your coins and savings.

Don't say I didn't warn you.

The lord has spoken.

I do agree your concerns are legit, but to say all exchanges will fall flat, is a bit too much of exaggerated don't you think so? I don't see any need to remove coins from exchanges I am using and I am happy to keep it safe out there and nothing is going to happen. Yes few rotten exchanges might be there but then there are other trustworthy ones to. All you need is to weed out the rotten ones and stick to legit ones. Kraken or coinbase in my opinion are legit. So if ones holds his coins out there I see no reason him/her to be worried about exchanges going flat.