I think EKWB will still make waterblock for EVGA best card, because they know what we want.
Most of people will want to buy EVGA just because it has great warranty and we can water cool it without voiding warranty.
So it would be only logical that EKWB will make block for those card and sell it on their own, without have any partnership with EVGA.
It would be very sad not to have EKWB waterblock for EVGA top tier card :\