Trends in reimbursement do not focus solely on anesthesiology. Medicare/medicaid reimbursement falls across the spectrum (and we were able to receive an increase in reimbursement rates at the last review, by the way).
Most people change not just for money, but for lifestyle. I have friends in anesthesiology making twice the amount as primary care physicians doing half time work or locums work. The flexibility of this specialty, portability of your skills, and limited drudgery (paperwork, office overhead, employees, etc.) are equally attractive to persons wanting to practice medicine but not wanting to LIVE medicine all day, every day.