On a side note on this "waiting for 10 years for KH III"-issue, that really comes over as ignorant and entitled because it was officially stated that there would be no KH III for quite a while.
This isn't like Versus XIII/FF XV which was announced and then descended into development hell for several years, making fans of that title arguably right to feel cheated and "betrayed" somewhat. KH III literally was not a thing which was stated more than once.
It is true that the handling of the handheld titles and also their quality leaves much to desire in some areas, as well as the mess that Versus XIII turned out to be resulting in a much bigger time gap I think even Nomura expected, but that still doesn't change the fact that these fans were literally "waiting" for something that was announced to not come several times during the time period 2005 to 2011/2012.
It was only around 2011/2012 that it was even confirmed that there would indeed be a KH III at all with Nomura speaking about some concept work and Re: Coded as well as Blank Points from BBS pointing towards KH III, but the official announcement was only at E3 2013 and strictly spoken that's the date one can earnestly start to count waiting time.
Anyone who was "waiting" for KH III in the years between 2005 and 2011/2012 was actually waiting for/chasing a non-existent phantom or a victim of wishful thinking. Any feeling of "betrayal" or similar is unwarranted simply because neither Disney, Nomura nor SE ever declared/promised anything that could be betrayed.