for the moment I trade all my altcoin with Bitcoin because I think Bitcoin will keep on increasing and increasing.
I would recommend against this.
You are trading cheap altcoins for bloated Bitcoin.
Eventually Bitcoin will go down and altcoins up. You will lose too much.
it depends on his strategy and if he has one, I do not expect him to have made a big mistake with the decision he has made so far. There is still enough time to get into the altcoin train since most of them are still low, and even if bitcoin will have to come down, he must have made a lot instead of the losses he could have made from the dip of the altcoins.
Even if bitcoin would go down, it would end up as a correction and if he can get the timing right, he should have gotten back into altcoins before they get pumped.