Shear is one thing...the gulf stream is another. The shear might effect it near landfall but the fuel will be right there to replace it.
I would assume that the meteorologists producing the forecast have taken into account for the shear vs. gulfstream in their prediction of some weakening over the next 72hrs. Of course putting one faith in forecasting capabilities of most weathermen may not be justified. But either way, Florida can expect a strong Cat 4 or even a Cat 5 storm this weekend.
Continuing prayers for those in the storm's path.