Is it because of the large number of altcoins?
Altcoins are a factor the more altcoins there are in the market the more market share they take away from bitcoin however that is not really the reason why the price of bitcoin is going down the price of bitcoin going down for the simple fact there is not a lot of demand and there is not a lot of demand because there was a very huge crash not too long ago.
The demand of bitcoin is still more than enough in the market and the prices are not low because of this silly reason. Besides that, altcoins are as far as concerned none of them has the potential of attracting the lot supporting bitcoin towards it. There are simple followers of bitcoin, nothing more than that. Prices were down because of the correction and they are soon going to recover. We should give bitcoin some more time.