I think with the increase in BTC, of course this will affect the prices of some altcoins in the market, but it seems that it will not affect investors' interest to invest in ICO, because we know for sure with the increase in the price of bitcoin, investors will invest more in bitcoin or altcoin which indeed already have an exchange market instead of having to invest in ico which does have a fairly high risk of fraud.
Right now as we speak, investors are losing interest day by day in investing in ICO and if you look at many projects that has been released, they dont meet up with their hardcap, which proves that investors are gradually leaving the ICO and if they will have to invest in anyone, they will invest in the top ICO that are already established and these are the coins that the surge of bitcoin usually boost when it is on bull run.
Most of the other altcoins that are below the top ones dont get any response that much but rather keeps going down in value, so if Altcoins increases in price today, those altcoins at the top that bitcoin has invested in will surely increases and investors will be more encouraged to invest in those coins during the surge.