I do not think that people have lost interest in the Altcoins, in any case, those who are in the crypto market for a long time. Previously, the Altcoins showed much more rapid growth and good profits. But today top coins have become too "heavy", too much money is invested in it, too many people want to sell the purchased coins at no loss. This leads to the fact that the price is extremely difficult to grow in such conditions.
I agree with your opinion, that for investors with small capital it is certainly very difficult to play bitcoin, because all popes gather there. Altcoin still provides opportunities for crypto trading, the real advantage is the same because of various factors such as proper analysis and luck.
Why do people hunt bitcoin, of course, the price factor is very high and its popularity is global, so the appeal is greater, but the capital needed to trade must also be large. Small capital must be good at seeing space to play in order to enjoy the benefits.