Always it is impossible to predict the future of altcoins, but at the same time block chain they were designed for continue to be used and developed, then the altcoins will continue in future also. Altcoins have a smaller investment when compared to Bitcoin. Many governments around the world are beginning to be legal to cryptocurrencies.
As long as bitcoin keeps doing halving mechanism and the chance for altcoin to increase will always there. The main important thing is since the inflation of bitcoin will have decreased due to the bitcoin halving and it will be also pushing the price to go up as soon as possible after halving has been happening. The futre of crypto will be surpassing gold. it will be achieved soon.
Bitcoins and altcoins will be around for a long time to come and from there, people will have the choice between altcoins or bitcoins. But if we are going to predict which altcoin will rise, it will not be easy because each altcoin will try to reach the top position. And even though the position of altcoins will continue to change in every altcoin season, it shows that altcoins will be around as long as bitcoins exist.
And when bitcoin and altcoins become legal tender, people will have more options to pay and not just use cash, credit or debit cards. And it also provides another advantage for people to have other types of investments besides gold, real estate and others.