If Monster Hunter or Pokemon can't, i wouldn't bet my biscuits on Splatoon 2 doing it D:
Though to elaborate, while Splatoon as an IP will, in my opinion, rival other IPs like Dragon Quest or Pokemon in Japan (If it isn't already), as seen with the recent COMG numbers, i don't think we'll see the peak of it with the second entry. I'm unsure if it'll peak anywhere near that number, but if it even gets close to it, that would be a colossal success for Nintendo, though as it is right now it's already massive.
Switch ID: SW-5475-6755-1986
3DS friend-Code: 4613-6380-5406