Many altcoins could be potential to increase, so you don't have to invest in the unknown project which doesn't have any potential in the future. If he can choose one or two altcoins at the market, he can expect to make a profit when the price increases. He can choose from the top 10 coin list, or he can buy bitcoin only if he is too scared to see the altcoin will bleeding again. The altcoin will have potential than the token because the altcoin already has a history from a long time ago.
The good thing when you are investing inside this market you have lots of time study before bringing your money inside. Alts that have solid finished product have a lots of potential to grow and to bounced back once the market regain and start to pumped again
I agree that solid project who already exist and place inside the top 10 or 20 from the CMC have a higher chance to bring good profits.