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.
It all depends on how much the price of bitcoin will rise.If this is a stable,good increase, then naturally investors will be interested in buying bitcoin.But this growth is not guaranteed,as well as profit from investing in ICO.So unambiguously say that better-very hard.