That is the part of market statistics. In other term we can say it is correction in the ICO market. After all this things it will be grew up again and reached on high position. It is normal part of ICO market. I hope end of this year surely all coins will also perform much more then our expectation so don't need panic at this time.

No, basically the price of ethereum doesn't give a huge impact to the price of altcoin but it seems like there was a party that has been controlling the hype and you can see that how it has become a very bad thing.
So far ethereum still follows the bitcoin and then the altcoin just try to follow that at the same time. 

Of course because many users who have purchased Bitcoin at very low prices are selling Them now.

I browsed this forum today and saw many people discussing the decline of cryptocurrency, the decline of bitcoin, the decline of Ethereum, and speculation that it is going to die. I don't understand why there is such an idea. I think the cryptocurrency market is down. a very normal thing,

This is on the grounds that the estimation of bitcoin is diminishing. At the point when bitcoin is diminishing all altcoins and tokens are likewise diminishing or gradually expanding. The motivation behind why is that incident this is a direct result of the sudden increment of bitcoin in the market last December. So for the time being Bitcoin and all different altcoins and in addition the tokens is simply taking a break from that quick stage increment of digital currencies. So don't freeze if the monetary forms are going down, they will recuperate soon.

I think because the price of all coins is tied to the price of bitcoin. As many scams and motion hackers.

I think the reason behind why alternative coins are dropping it
because of the sudden change of the business environment and of course because of the law of the demand that can affect everything in this business.

Panic selling i guess. But the main reason i think is it's part of the market. And a market have also a downside. Its not always moon. 

Actually, this is not a new thing happening, and it is a routine fall, you can understand that when btc is  down it effects the whole market, people got panic and start selling, reason slowly downfall grab the entire market and other coins start falling, as per routine it will rise again as if you check the previous years market results.