lol.. It does seem the more Democratic minorities get, the more Republican whites get. But still, long term demographic trends favor Democrats in Florida. This is so long as current trends hold, and minorities continue to vote heavily Democrat. Especially with Hispanics, that is always a question.
I do not believe Democrats can rely solely on demographics to retain their edge in national elections. Even with changing demographics, our party is still disadvantaged naturally in the house with Democrats being packed in urban areas. This is before evil Republican gerrymandering.
Like like the original poster asking why Florida is purple instead of blue, it is just as applicable to ask why Texas and Georgia are so media-red, why Iowa and Wisconsin are quite Democratic, why Republican still often lose statewide in West Virginia and Missouri.