I do not think that altcoin can somehow influence the development of bitcoin, since most coins do not have a working product and stop in development. On the contrary, the price of all altcoins depends on the bitcoin price, and it is difficult for me to assume that any of the coins can replace the importance of bitcoin for the crypto-currency industry.
Yeah right, bitcoin is the basis of the market price and this is the currency used by all altcoins, It will really hard to believe and hard to think that altcoin can become a threat to bitcoin.