Firstly, Dragon Quest games are not developed by the 1st Production Department(or any SE production team) so another would certainly not be unveiled at this event. And I'd imagine quite a bit of people enjoy the DQ series as it is the most popular gaming series of all time in Japan.
Being "neverending" is irrelevant.The games are, like Final Fantasy, self contained in different worlds with little reference to past stories. The title does not change that.
And yes people enjoy the series. The stories are charming and simple, with interesting(and charming) characters, wonderfully realized worlds, decent character/monster designs, and addictive(yet simple) gameplay. Pretty much the antithesis of Kingdom Hearts.