Dumb Question About 64-Bit Mobile topic

Okay guys, allow me to be the village idiot. But, this year, I've heard a lot about 64-bit processes. What I'm confused about, is that if the future we're going to be making 64-bit mobile devices, what's the point now of having dual, quad, and octa-core phones from the past 1.5 to 2 years?

Remember when dual-core computers started coming out, but, the majority of the people had 32-bit OS's? Is this what we've been doing this whole time in the mobile world?

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