now they are dumping for lisk and they will dump again for something else and so on
Sure, ok.
I also think same about alt coins, they are there just to make our bitcoins busy. Of course many of that coins people use for different things. There is new coin almost every day and people are just use them to earn more coins. But its not easy, following that coins is a hard work.
Cause of that I trade more on luck and advices from much experienced traders.
I don't think any coin can replace btc, or even come close to btc. Yes there will be good one's but they will need to touch 100 $ to become more serious threat to btc and I don't see that something like that will happen anytime soon.