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Bitcoin is still very much used and adopted all around the world to this day. It has been accepted by organizations and payment gateways all across the world. So what about Altcoins? Are they worthy to buy in future? To predict the future is very hard. In the cryptocurrency world, prices are very volatile. Dealing with the issues of transparency and scalability problem, might effect cryptocurrencies in the future.
For altcoins, they're indeed worthy to buy but they're might end up just being few that can last long. Back in the days that we're still supporting ICOs, the coins that they made just ended up losing its value over the day because of dumps obviously.
Prices are indeed volatile and whales somehow have something to do with that volatility.