Obviously, over time, many coins will not be able to compete and make a profit. In general, the whole system of crypto currency can not be durable and constantly successful. I think that for some time we will stay afloat, and then many people will leave this kind of earnings, disappointed in it. Although a year or two we still have to do something for this direction and get some feedback and result.
Most of the altcoins are not surviving because of the team handling it, after they got the investment or the money that they need they are not protecting their investors, sad but we should protect investors for the sake of the trust and credibility.
I also think that part of the project team, their plans and their roadmap is very good, but they do not produce good products, bad project management, so that the community gradually leave and no people use the product