I will also do like that, buy some altcoins that keep them in the wallet for the next 5 years, will I become a billionaire? Who knows? 
No one knows what will happen in the future. We only think of the positive option but it can also be negative. We don't want to think about it. So we should keep two options positive / negative in mind. If you buy Altcoin at a higher price now, you may lose instead of your profit after 5 years.