The people flowing in are retirees. That demographic is a net loser for a state. They are going to need LOADS of services and they are on incomes. I suspect as the retirees age, those low-no income tax states are going to need to make changes to their taxation policies.
Hmm, why do you feel they will need loads of services?
What services do you feel that retirees would be in need of that would unduly burden a state?
It appears that your assumption is that these services must be supplied by government. Why do feel that government would be providing them versus the private sector?
I know your post is based on "feelings" so I have not pinned you down to any specifics. Your feelings as they relate to these questions will be adequate.
Florida is a state with a very high percentage of retiree's and has been for a long, long time. How much longer do you feel they have before Florida is in a financial bind?