They've lost a ton of money in Fla. It does them no good to cut and run after they've already lost the money. The reason why they are cutting and running are 1) they realize that they underestimated the risks, and 2) the regulators won't let them charge a premium that is based on the true risk.
I thought the concept of insurance was everyone pitches in and the insurance company make a profit over the long haul. That is why they are regulated so they don't take advantage of the climate (no pun intended). Yes one bad year but how about all the good years. Texas has not had a hurricane hit the cost in years so the insurance companies are make good money. I would be disappointed if they just packed their bags after one bad season.