When considering altcoins prices meanly they are depend on behavior of bitcoin. But when considering technologies of altcoins some have really productive technologies. So they should have good future. As investors it safe to invest on those by splitting investment on best altcoins.
I think if we have linked it to BTC's influence I think all altcoins will have more or less the same impact. So for the future we have to look at the altcoin side, not only about whether their goals are running or not. Altcoin is not productive, it's more to "Profit" although 80% of them are sick.