This entire space is incredibly new and incredibly small relative to traditional financial markets. As a result there's huge volatility pretty much across the board. This is no bad thing. A lot of poor coins and badly thought through and hastily launched token sales will fall by the way side. But those with utility will thrive and grow by several orders of magnitude in the coming years. Play it long people.
Its normal to experience some price dips, dont think that altcoins are already dying. Because of these hard forks, its hard to say what the price of bitcoin and the other coins may be because altcoins are also affected by the hard fork and price of bitcoin. It is still good to invest in other coins and it is possible for the price to shoot up after the fork so I dont believe that altcoins are dying.
And I totally disagree that altcoins are dying. Of course, the market is overflowed with a heap of useless altcoins with don't have any real values, but those alts that are in top 50 of Coinmarketcap will most likely grow in price with the growth of bitcoin. More and more people transfer their savings into cryptocurrencies and it of course rises the price of BTC and ALTs.