Yoshida is both producer and director, and some other key-role have been modified/completed too. Thus the changements in the game are not the consequences of the change of producer only.
The main role of a producer is to handle budget and schedule (and if Tanaka has failed somewhere, it is here), then it's variable from project to project. It seems you trust Tanaka, so you should read this : http://ffxiv.zam.com/story.html?story=23393&storypage=2
However, there are those with different concepts of what is ideal and there can be more than one version of the "best." So this time, Director Nobuaki Komoto and his crew are creating their own version of the ideal MMORPG -- Final Fantasy XIV.