Jani believes that if SegWit is activated on 1st August,all Altcoins will go down and that includes icn also.
They can't open the platform to public on that day.Maybe he meant 1st August next year

Segwit will not activate on Aug 1st. UASF will activate on Aug 1st. Segwit has a long way to go before activation.
Regarding BTC vs Alts if segwit gets activated... BTC will rocket up. I'm expecting minimum $5000/BTC. The Alts in relation to BTC will drop, but in USD values, it'll probably hold steady.