^This. Everyone listen to this man, he gets it.
The previous events were actually exceptions rather than the rule. The FFXIII event was actually a result of a private joke shared at E3 between Yoshi and Toriyama (as well as cross-marketing for the FFXIII-tie-in title). The FFXI event was a crossover celebrating FFXI's eleventh anniversary of service. The Dragon Quest event was similarly to celebrate DQX's first anniversary of service (it was also the previous title Yoshi worked on.).
These all have some meta connection to FFXIV's development besides pointless fanservice. FF Type 0 or any other FF game don't. Hence, no crossover events for them. And there probably never will be, for good reason.