I approve in that strategy but I think it depends on the people who owns the money. But I prefer to the begginers like me is having bitcoin in wallet as big investments of yours than some altcoins. To make it more easy to make your profit groe bigger than altcoin. Just like what my friends did to their noney more bitcoins than their altcoina that they have in their wallet.
I can't say it's the best strategy or recommended to sell altcoin and buy bitcoin. And I think it's a big risk because we all know that the price of the bitcoin now are still in the downstream. If you see the potential of the bitcoin will goes up in a few weeks well it's time to sell all your altcoin then invest it in the bitcoin.