No sign yet of increasing shear adversely affecting the system, as noted by NHC in their latest discussion. They seemed to have backed off on weakening the storm much before landfall. The system increasing in forward speed in the same direction as the deep layer flow will mitigate the shear effects somewhat. That is why it looked so dangerous for Florida a few days ago when it looked like a stronger Wilma was going to go through the Yucatan channel... there was not going to be much time for the shear to weaken it once it reached the Gulf. As it is, it is still a large and dangerous hurricane and should not be taken lightly.