I personally still see omisego, siacoin, populous, golem, bancor and others still remaining in the top 100 coins. Just like you, I was surprised that many alt were thrown out and many newcomers were replacing them. Is this fair competition?
Doesn't look like any competition to me. Many of the coins that got replaced on their spots were simply replaced because of the state of the market. The daily trading for those coins simply increased and as such it increased their marketcap alonsgide. This helped them replace other coins on their favourite positions.