Thanks for the question. I think it's too specific to look at a place like FL vs the Carolina coast. Part of the analysis is pretty basic. The more active a season is the more likely there is a landfall generally, just because more storms equal more opportunities. In my analysis though, it goes a little beyond that. First, look at the thermodynamic environment in the genesis and "final track" (locations that a TC would need to cross to make landfall) areas. In spite of Erin's impressive wake, there is still an enormous amount of untapped potential in the Gulf, Caribbean, and in the southwest Atlantic.
Second, I think the ENSO and wet Sahel analysis is compelling. I think the wet Sahel in particular is interesting because track density is consistent with what looks like a hostile tropical Atlantic that suppresses waves until you approach the Antilles and SW Atlantic. I also think that the anomalous troughing that we're seeing now in the east, while certainly a pattern for recurves, would quickly become a pattern for pulling Caribbean or SW Atlantic homebrew systems north if you look at it, especially if that pattern retrogrades as we head deeper into September (where I doubt we produce consecutive negative departure months in the eastern part of the country.
I also think climatology plays a role here. @GaWx had a very interesting post looking at east coast landfalls later in the peak season. Storm genesis location matters here, and I am thinking with a slightly less robust wave train from past years, we see vigorous, but weaker waves that can get further west into the Caribbean or SW Atlantic. This could have implications for the eastern Gulf, but I do think troughing will be more of a feature that would lead to earlier turns than the western Caribbean unless something obviously develops there. I do think homebrew is the most likely way the east coast sees a hurricane strike.
I actually think it probably means less of a chance, unless there is meaningful activity in the eastern Gulf (which has also been a hot spot of late so that can't be ruled out).