I'll make an actual serious reply, here goes:
First off, lets address the exposure of dragon quest. The last major DQ to come out in the west before DQ11, DQ8. Hold the phone before you flip about 9, I'll be getting to that.
DQ8 came out in November 2004, to compete with a plethora of stuff taking other peoples attention from World of Warcraft, to Vampire Masquerade, Gran Turismo 4, blah blah. It did well but let me iterate people were highly distracted at its release and after.
Then comes DQ9, its handheld only. This is where things start going wrong. New generations of RPG gamers appear, and these gamers grow up on totally diff titles that are not named dragon quest. They are console players and either don't own a handheld or go to it only for big things like pokemon. So DQ9 gets played by people who love the series and others who know its good through the grapevine, but ignored by a new generation of maturing gamers.
DQ10 gets skipped.
DQ11 arrives in 2018. Twenty fucking 18. It has been fourteen years since a DQ game has garnered the attention of a console player base. There are people posting on this fucking sight who were too young to know about DQ8 and touched jack shit of it until now. Fuck sake some of these people too young to have been exposed to it back then are graduating from college by now.
They retained old fans and had a terrible growth for new ones. In those 14 years entire IP's arrived and fell, and were even replaced. In those 14 years people began to see turn based as terrible (not my opinion), and weeb RPG's as uninteresting.
Top it off with the other stuff that is often easily assumed, JP's go apeshit over Akira Toriyama style art while westerners as a whole find it childish looking/boring and cheap compared to more contemporary art styles.
I knew before DQ11 came out that it would suffer incredibly, all the signs were there. Its what happens when you assume everyone knows about your product.