its not numerical order in terms of the sequel. not kingdom hearts 3 next time. well aside from that...yeah i guess the story could use more of that useless romance stuffs...
*weird hypothesis*
coming from the big man himself, nomura said that the sequel will not be "Kingdom Hearts 3", nor will the series continue in numerical order. maybe he might come out with like kingdom hearts 5 next...which jumps way past the events of kh2, then makes the players extremely curious as to what happened prior to the events of kingdom hearts 5, as then which nomura will release kingdom hearts 3 and then kingdom hearts 4 later on...kinda like what george lucas did with star wars by starting with episode 4 and ending with episode 3...