The thing is that Disney, as last minute marketing initiative before the premiere, counted on the fans, trying to capitalize on the surprise phenomenon Bronies became for that market. What they got was the grand opposite of that.
First, the Furry fandom is a queer one, meaning that evergreen and wholeseome fan-art and merch is thrown out the window in favor of lewd and sexual ones that reflect the age demographic that populates it. What was the first "scandal" surrounding Zootopia? a sex-negative petition against lewd Zootopia fan-art. What followed it? The infamous "I Will Survive" fan-comic that touches on the topic of abortion. And this will continue to happen because the demographic that loves Zootopia is a queer one that easily sees our beloved characters in less child-friendly scenarios and will keep go on with that.
That teaser that blatantly spelled out the word A-N-T-H-R-O-P-O-M-O-R-P-H-I-C opened up a Pandora's box for Disney.
So the lack of official merch is indeed a bummer, but that's pretty much what Disney had in mind, because they didn't thought through well enough. There are Nick & Judy sex toys at Bad Dragon now though.