I believe some people were curious about this.
Source: http://www.siliconera.com/2016/02/0...-dragon-quest-builders-2/#tYt3cXQeytDtwibR.99Siliconera said:He is then asked about possibly implementing multiplayer sometime in the future.
“As far as Dragon Quest Builders 1 goes, it is not possible,” responded Fujimoto. “But if there’s enough demand, I’ll put it into consideration for the next title.”