The best thing for them to do with the next Dragon Quest game would be to go multiplatform. The only reason people want it exclusive to a certain console is because that console is their favorite and they want another exclusive to try and brag about/feel good about. This can be said about any game anyway.
The PS4's userbase in Japan is very small and it's smaller than the Wii U userbase in Japan. They should just put it on PS4/WiiU/3DS/Vita/etc. Even port it an Xbox One version if they want to, or maybe an NX version as well if the NX is out by the time the game is releasing. I know they said it would be a console game but I still wouldn't be surprised if there are handheld versions of it either.
I would easily understand making it exclusive to the PS4 or something like that if the PS4 had a very big userbase in Japan but currently it does not. If people really want it to be exclusive to something then once again the 3DS would be the best option for them sales-wise and userbase wise. Like I said even the Wii U has a bigger userbase in Japan than the PS4 so it would even make more sense for them to make it exclusive to Wii U if they wanted to.
