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No it has nothing to do with the decrease in Bitcoin! People start other crypto currencies either because they see something lacking in Bitcoin that they feel is important and want to bring it to the market, they want to use it to fix a certain problem or they want to raise funds for a project not all crypto currencies are the same

Some are a store of value, some are a medium of exchange, some is stake in a company! They don’t really compete with Bitcoin

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STEEM 0.27
TRX 0.11
JST 0.030
BTC 68905.09
ETH 3808.71
USDT 1.00
SBD 3.48