Maybe but I'm actually pretty curious on why they couldn't do anything about it then. They did talk about Joyboy but I wonder if its something that only Luffy could activate with Gear 5.
Given that gear 5 is basically just toon force, and we know that whatever is there made Rogers laugh his ass off, if it is going to be something involving sea levels, I bet it's a cartoonishly large corked drain that will drain the oceans back down to reasonable levels, but only nika can actually remove the cork.
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"History Is Much Like An Endless Waltz. The Three Beats Of War, Peace And Revolution Continue On Forever." - Gundam Wing: Endless Waltz