DYOR, weigh the risks and make a balanced portfolio that consists of multiple things, not only BTC and alts, but also maybe stocks and precious metals.
You could be right mate an investor must contain all these things in his portfolio as it gives profit from time to time but I personally think that instead of investing in so many things we should simply invest in bitcoin as it has so much ability to get you good income. In the case of Altcoins, I like to have ETH and ripple otherwise I will only invest in bitcoin.